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jr05 01-09-2012 09:11

Un-burned Powder
 
Not sure if this is the right title, but I think I am having an issue with the charge not completely burning before the bullet leaves the gun. I am getting some soot on the outside of my shell casings and I have noticed some increase in flash compared with factory ammo (WWB).

9mm
124gr MG CMJ
4.8gr WSF
Remington 1 1/2 primers
1.158" OAL

chrono 1050 FPS out of a G34

What can I do to try to get rid of this issue (all rounds function flawlessly and have good accuracy, so not really a huge issue). I have heard that a low powder charge can do this, but I don't really want to increase my charge since these hit the speeds I am looking for already. I was thinking decreasing the OAL a bit might give me better results as it would take slightly more time for the bullet to leave the casing, giving the powder more time to burn? I am I completely off in this thinking?

Thanks for any advise!

fredj338 01-09-2012 09:44

You are running right @ the edge of bunnyfart loads (1000fps) & WSF is a bit slow for that. I have a friend does the same thing in his 40 w/ the same results. Bump the charge a bit & it should go away. Yes you will have more recoil @ 1100fps, but the gun will shoot cleaner, probably more accurate too. Decreasing the OAL raises pressures, like adding more powder, same thing, vel goes up. You want to get the the chamber pressure up so the powder burns more completely. If you want to run under 1050fps w/ 124gr bullet, you may want to drop a powder speed to W231 or WST if you like Win powders. Higher pressures w/ lower vel, more complete powder burn.

shotgunred 01-09-2012 09:46

Mostly I use TG for IDPA but here is a good WSF load I use also. Not much different than yours.

9mm
124gr PD
4.7gr WSF
CCI/federal
1.125" OAL

129 PF

fredj338 01-09-2012 13:11

Quote:

Originally Posted by shotgunred (Post 18406567)
Mostly I use TG for IDPA but here is a good WSF load I use also. Not much different than yours.

9mm
124gr PD
4.7gr WSF
CCI/federal
1.125" OAL

129 PF

Except your shorter OAL is adding about 50fps or several 1000psi which is just like adding powder. Gun dims can also play a part in pressures. tighter bore, longer lead, larger chamber, it's why guns give diff results, but you know that.:supergrin:

shotgunred 01-09-2012 14:39

My G17 actually Shoots the most accurately at 5.2 GR. But 4.7 is more then accurate enough for IDPA and it still makes the power floor.

Win 231 is the powder that leaves powder burn on my cases with bunny fart loads.

jr05 01-09-2012 14:44

I will give the shorter OAL a try next weekend on a few rounds and see how they work out. It isn't a huge issue, and isn't as bad as sooting I have seen on my scavenged brass at the range. I just think I can make it bit cleaner.

I am going for lower PF loads so want to stick at or just over 1050 to make the 130PF which I will use for USPSA and IDPA both. No sense in having 2 different loads.

I am going to drop down in 0.010" increments and see what I get. Worst case, I just use the 1.158" I am now, and deal with it. Definitely not a "deal-breaker"

F106 Fan 01-09-2012 15:34

I mentioned in another thread about JUST getting a copy of Richard Lee's "Modern Reloading - Second Edition". I haven't even begun to read it!

In it, he discusses case capacity and how much it is reduced as rounds are loaded shorter in terms of both reduced case capacity and increased pressure (starting on page 96).

His example of a 1/16" (0.060") change in OAL makes a 14% change in case volume for a .45 ACP (it would be more in a 9mm, I think). There is a table that enumerates %change in pressure for 1% change in volume. For a powder like Titegroup, the %change is 2% for every 1% change in volume. That number is HUGE even with light loads.

Bottom line, be careful when you make large changes in OAL, especially on small cartridges.

I have mentioned elsewhere that I use 700-X for .45 ACP and I will admit that I get a LOT of soot and the cases have a black smudge on the outside. It's been that way for many years and I don't expect it to change. I just don't get too excited, one way or another. They go 'bang' and the bullet usually goes right where I was aiming (whether I was aiming correctly is another story) so I just keep making them.

Richard

fredj338 01-09-2012 15:38

Quote:

Originally Posted by jr05 (Post 18407697)
I will give the shorter OAL a try next weekend on a few rounds and see how they work out. It isn't a huge issue, and isn't as bad as sooting I have seen on my scavenged brass at the range. I just think I can make it bit cleaner.

I am going for lower PF loads so want to stick at or just over 1050 to make the 130PF which I will use for USPSA and IDPA both. No sense in having 2 different loads.

I am going to drop down in 0.010" increments and see what I get. Worst case, I just use the 1.158" I am now, and deal with it. Definitely not a "deal-breaker"

Read my blog on vel/pressures vs OAL. Reducing the OAL will increase your vel or you can leave the OAL alone & up the charge a bit or you could try a mag primer. Either way, you are going over 1050fps. Really, it's a 9mm, I doubt adding 50fps changes the recoil impulse all that much.:dunno:

WiskyT 01-09-2012 16:12

I've read where 45 Colt rounds will soot if held at the standard 12 or so kpsi that it was originally designed to operate at. In other words, if you use normal 45 Colt loads, you will get soot.

fredj338 01-09-2012 17:13

Quote:

Originally Posted by WiskyT (Post 18408094)
I've read where 45 Colt rounds will soot if held at the standard 12 or so kpsi that it was originally designed to operate at. In other words, if you use normal 45 Colt loads, you will get soot.

Pretty much, depends on the chamber size & brass used. I have a custom built Colt SAA/Army SM gun I used to shoot CAS with. It has tight chmabers & runs pretty well w/ light loads. Shoot the same ammo out of my generous chambered 1866 & soot half way down the case.

vtbluegrass 01-09-2012 17:15

Bump up the charge or if bunnyfart load is what you were going for switch to WST.

njl 01-09-2012 17:30

1.158" is kind of long. Why not just try shortening them to around 1.140" and see what happens. If you're not seeing flakes of unburned powder left behind in the chamber or mag, and you're happy with the recoil, velocity, and accuracy, why worry about it? Guns get dirty when shot...and you're going to tumble the brass before reloading it.

TX Archer 01-09-2012 18:00

Quote:

Originally Posted by jr05 (Post 18406432)
I am getting some soot on the outside of my shell casings and I have noticed some increase in flash compared with factory ammo (WWB).

Two questions:

1) What causes the increased flash?
and
2) In this case, should the soot on the cases clear up when he increases pressure and the powder burns more efficiently?

Thanks!

fredj338 01-09-2012 20:57

Quote:

Originally Posted by TX Archer (Post 18408709)
Two questions:

1) What causes the increased flash?
and
2) In this case, should the soot on the cases clear up when he increases pressure and the powder burns more efficiently?

Thanks!

THe powder isn't completely burning in the bbl & then as it hits the end of the muzzle it flashes over. The soot is from the brass not expanding enough to seal the chamber off. This can be individual to your gun BTW. A very slightly larger chamber w/ moderate pressure load won't seal the case against the chamber wall on firing. Same for using hard brass w/ light loads, like maybe +P brass in some caliners.:dunno:

PCJim 01-09-2012 21:02

1. Quite probable, if there actually is more flash, that more powder is still burning as it is exiting the barrel.
2. Usually, the sooting goes away as the pressure is increased. The lower pressure does not adequately seal the case against the chamber wall, allowing gas to escape around the side.

Fred, you're tying faster than I can on this iPhone while watching the Bowl Game..

TX Archer 01-09-2012 21:11

Thanks a lot to both of you!

fredj338 01-09-2012 21:47

Quote:

Originally Posted by PCJim (Post 18409711)
1. Quite probable, if there actually is more flash, that more powder is still burning as it is exiting the barrel.
2. Usually, the sooting goes away as the pressure is increased. The lower pressure does not adequately seal the case against the chamber wall, allowing gas to escape around the side.

Fred, you're tying faster than I can on this iPhone while watching the Bowl Game..

Yeah Iphones suck for typing & I don't get too excited about college ball games. So I am here, finishing up some work on the puter, getting ready to go to the gym. Yeah, I make time to do such things & still manage to reload & shoot!

pasky2112 08-20-2012 14:21

Unburned Powder in Sub-max Loads
 
If I may butt in here... :wavey:
I'm researching an issue I have just seen in my new 10mm loads. I have actual unburned powder ( Blue Dot discs ) forward of my muzzle with only mod loads... for ex.:
155g JHP (montana golds)
12.5g BD
CCI- 300 (LPP)
1.260" COAL
I'm shooting these out of a factory new G20FS...not SF... w/ stock bbl and a 22# SS RSA. I know BD is slow but the max load for this in Hornady guide is 12.9g. But I was also getting less than advertised vel.'s per book speeds. Usually, I get higher than adv. vel. in .40 loads out of this book. Not sure that even matters. But something is afoot at the Circle-K. :dunno:

So, why the inefficient powder burn?
Maybe shorten my COAL gradually but hold the charge?
Use mag primers ( CCI- #350 )?
Is this characteristic of BD w/ lighter projectiles?

I have other powders that are faster but I bought the 5# keg of BD specifically for loading hot 10mm. It seems like I'm just wasting powder. I'd' like to resolve this issue. (duh) I'm open to sound advice from anyone else who's seen and resolved this 'problem' and would like to share some remedies. TIA!! :bowdown:

WiskyT 08-20-2012 14:38

Quote:

Originally Posted by pasky2112 (Post 19328600)
If I may butt in here... :wavey:
I'm researching an issue I have just seen in my new 10mm loads. I have actual unburned powder ( Blue Dot discs ) forward of my muzzle with only mod loads... for ex.:
155g JHP (montana golds)
12.5g BD
CCI- 300 (LPP)
1.260" COAL
I'm shooting these out of a factory new G20FS...not SF... w/ stock bbl and a 22# SS RSA. I know BD is slow but the max load for this in Hornady guide is 12.9g. But I was also getting less than advertised vel.'s per book speeds. Usually, I get higher than adv. vel. in .40 loads out of this book. Not sure that even matters. But something is afoot at the Circle-K. :dunno:

So, why the inefficient powder burn?
Maybe shorten my COAL gradually but hold the charge?
Use mag primers ( CCI- #350 )?
Is this characteristic of BD w/ lighter projectiles?

I have other powders that are faster but I bought the 5# keg of BD specifically for loading hot 10mm. It seems like I'm just wasting powder. I'd' like to resolve this issue. (duh) I'm open to sound advice from anyone else who's seen and resolved this 'problem' and would like to share some remedies. TIA!! :bowdown:

I would check out data in other manuals. Many times, some manuals are much lower than others in terms of charge weight. I don't load 10mm so I don't know the ins and outs of it. But, I have learned that for the most part, Hornady and Lyman manuals are very conservative. I'm not saying just increase the powder charge willy-nilly, I'm say see what Nosler, Speer, and Sierra have to say about it.

Taterhead 08-20-2012 16:27

Quote:

Originally Posted by pasky2112 (Post 19328600)
If I may butt in here... :wavey:
I'm researching an issue I have just seen in my new 10mm loads. I have actual unburned powder ( Blue Dot discs ) forward of my muzzle with only mod loads... for ex.:
155g JHP (montana golds)
12.5g BD
CCI- 300 (LPP)
1.260" COAL
I'm shooting these out of a factory new G20FS...not SF... w/ stock bbl and a 22# SS RSA. I know BD is slow but the max load for this in Hornady guide is 12.9g. But I was also getting less than advertised vel.'s per book speeds. Usually, I get higher than adv. vel. in .40 loads out of this book. Not sure that even matters. But something is afoot at the Circle-K. :dunno:

So, why the inefficient powder burn?
Maybe shorten my COAL gradually but hold the charge?
Use mag primers ( CCI- #350 )?
Is this characteristic of BD w/ lighter projectiles?

I have other powders that are faster but I bought the 5# keg of BD specifically for loading hot 10mm. It seems like I'm just wasting powder. I'd' like to resolve this issue. (duh) I'm open to sound advice from anyone else who's seen and resolved this 'problem' and would like to share some remedies. TIA!! :bowdown:

Blue Dot does cleanup with more pressure. With a full-house charge, spent cases are sparkly clean with virtually no residue. I would look to other adjustments before going with a mag primers.

I like to seat 155s at 1.25". Do you have good neck tension? That helps with the slower-burning powders. Reducing the COL will reduce case volume and might contribute a bit to additional neck tension by putting more bearing surface in the case.

I have not shot the 155 MG, but 155 XTPs at 12.8 grains are pretty clean-burning and running at about 1400 fps. CCI 300 primer, Starline brass, and 1.25" COL.

My guess is that even with some unburned flecks, you are still getting pretty good groups. I have found Blue Dot to group well even when not pushed. If it is otherwise functioning well, I would not be too concerned with unburned flakes. Your gun will get pretty sooty after a while though. For a few years, my IDPA load was a modest pressure 180 gr Blue Dot load. It grouped very well. My gun would get pretty sooty, but it would still run 100% even with a few hundred rounds between cleanings.

Regarding velocities, you are running a shorter barrel than most books, so Hornady Blue Dot data is running a bit slower for me than what Hornady publishes. Other loads like Accurate no. 9 track a bit closer for some reason.

fredj338 08-20-2012 18:30

BlueDot is really quite slow burning & runs best closer to max. So if you want midrange loads, I would switch to something like PowerPistol.

dla 08-20-2012 19:21

They're not "unburned". They are powder zombies.

pasky2112 08-21-2012 09:44

Quote:

Originally Posted by Taterhead (Post 19328978)
Blue Dot does cleanup with more pressure. With a full-house charge, spent cases are sparkly clean with virtually no residue. I would look to other adjustments before going with a mag primers.

I like to seat 155s at 1.25". Do you have good neck tension? That helps with the slower-burning powders. Reducing the COL will reduce case volume and might contribute a bit to additional neck tension by putting more bearing surface in the case.

I have not shot the 155 MG, but 155 XTPs at 12.8 grains are pretty clean-burning and running at about 1400 fps. CCI 300 primer, Starline brass, and 1.25" COL.

My guess is that even with some unburned flecks, you are still getting pretty good groups. I have found Blue Dot to group well even when not pushed. If it is otherwise functioning well, I would not be too concerned with unburned flakes. Your gun will get pretty sooty after a while though. For a few years, my IDPA load was a modest pressure 180 gr Blue Dot load. It grouped very well. My gun would get pretty sooty, but it would still run 100% even with a few hundred rounds between cleanings.

Regarding velocities, you are running a shorter barrel than most books, so Hornady Blue Dot data is running a bit slower for me than what Hornady publishes. Other loads like Accurate no. 9 track a bit closer for some reason.

Great points. The G20 shoots GREAT! It's a keeper and I LOVE it! I just got it so I'm getting the feel of it shooting ~45'/15yds and getting about 3" grps standing shooting supported. For now, I'm OK with that. Coming from Precision Rifle background, that was HARD to accept when I started pistol...I digress.
I think going to mag primers might be too drastic at this point. Thinking of reducing the COAL to 1.250" first, with following 12.0g BF load.
My load is not far from yours, Taterhead, and I'm getting significantly lower vel.'s... for ex. in my G20 stock bbl:
155g JHP MG w/ 12.5g of BD CCI #300 @ 1.26" - avg 1210 fps in 15 rd string. (ES-60, SD-19) According to avg data, I'm about 100-150 slower with this load.
Another load with 12.0g of BD and exact same components, day, string ct., ect. avg 1178 fps.
Whattya guys think about running the sub-max loads (12.0g BD above) back through my resizer to reduce COAL to 1.250" then re-crimp w/ usual Lee FCD ? I'd think it'd be more 'apples/apples' but not sure of any gotya's.

Bottom line is that I'd like to see less unburned powder via improved powder combustion efficiency in reasonably charged loads in a reasonable bbl length. I'd care less if I was shooting a 2" bbl ...but 4.6"... it shouldn't be snowing BD flakes everywhere. ;)

THX!

pasky2112 08-21-2012 10:01

Quote:

Originally Posted by fredj338 (Post 19329410)
BlueDot is really quite slow burning & runs best closer to max. So if you want midrange loads, I would switch to something like PowerPistol.

Power Pistol is my fav .40 load. I WILL eventually dev a load in 10mm w/ it for IDPA.
I'd really like to get the BD combustion issue solved in 155's. If not, I may use it for heavier 180's. I just want a fast mid-range round to try silhouette shooting @ 50 yds. Besides, I can't back down to an obstacle and challenge of figuring this BD out. There's something new to learn, here. ;)

Thanks for sharing!

WiskyT 08-21-2012 10:16

I checked Alliant's website and their max is below what you are running so the Hornady data might be a true max. Some powders will leave unburnt flakes and you might just have to live with it with the 155's. The range floor used to have so much left over 296 from when I ran it with 125's in 357mag that the floor would be slippery and it was truly at a max load.


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