[scccdoc]

Do you carry the same ammo for both? I was wondering because of powder burn rate vs. shorter barrel. DOC

[TBO]

Same.

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[Fed Five Oh]

yes..

[scccdoc]

Wasn't sure but assumed so, thanks guys.

[Apetrulis01]

same......duty issue

[awoodpd13]

Now retired, but I *DID* carry our issue ammo in my G22 and my BUG/OD G27.

[rdstrain49]

Never gave it much thought, but yes same ammo. Now I'm curious, next time I have the chronograph set up I'll shoot a string through the 22 & 27 just to see how much difference there really is.

[scccdoc]

Originally Posted by rdstrain49

Never gave it much thought, but yes same ammo. Now I'm curious, next time I have the chronograph set up I'll shoot a string through the 22 & 27 just to see how much difference there really is.

Please pm me with results. I reload range rds and may want to change my formula. Thanks, DOC

[Morris]

Yes. Policy.

[lovetofly08]

As pretty much everyone else has said yes I carry the same

[rdstrain49]

Originally Posted by scccdoc

Please pm me with results. I reload range rds and may want to change my formula. Thanks, DOC

Yes sir. If the weather holds, I'll get to it MAYBE tomorrow. There will of course be an extra charge for expedited service.

[Line Rider]

Same ammo. That why I bought a GL27 to go with my GL22. Two guns, one type of ammo.

[LAWDOGKMS]

.165 Gr Gold Dot is effective out of either..

[scccdoc]

Originally Posted by rdstrain49

Yes sir. If the weather holds, I'll get to it MAYBE tomorrow. There will of course be an extra charge for expedited service.

Put it on "account"

[bac1023]

Probably better posted in General Glocking...

[jeremy1]

I asked this question about 5 years ago and someone had data with velocity differences between models. If memory serves me there is about a 100 fps difference between each barrel length.

[District18]

Sometimes. I foresee that it will be policy soon.

[ravenlancerx]

Same,but not policy (yet)

[Presscheck40]

I carry a 35 and a 27 everyday same gold dot ammo for me.


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[rdstrain49]

Chronograph results, interesting and NOT very impressive.

Ammunition Black Hills 180 gr. JHP so called duty loads.

G27 average vel. 913.6 fps
G22 " " 978.7 fps
Difference 65.1 fps

Black Hills Ammunition claims 1,000 fps from this load, but no information is provided as to what firearm was used or if a universal receiver was used.

[GSSF17]

Same. Winchester Ranger. Either that or Federal Hydra Shok is Policy. No chron info, sorry.

That said, I am not a fan of the .40 S&W. My other BUG is a G36. It's hard to beat the flying ashtray.....

[scccdoc]

Originally Posted by bac1023

Probably better posted in General Glocking...

You are probably right, my apologies. However, the same thought process is applicable to a full size M&P and the compact (or the Shield), 1911's in full size and compact versions,etc. My question was not composed properly I guess because the impetus was barrel length vs. burn rate of powders.

[wanderinwalker]

Originally Posted by scccdoc

You are probably right, my apologies. However, the same thought process is applicable to a full size M&P and the compact (or the Shield), 1911's in full size and compact versions,etc. My question was not composed properly I guess because the impetus was barrel length vs. burn rate of powders.

Powder burn rate versus barrel length really doesn't matter. Or put another way: max performance of a given cartridge is going to be had with the same powder, irrespective of barrel length.

They're not .40s, but I have chronographed my Glock 17 and 26 side-by-side a few times. On average there's less than 100-fps difference between them. WWB 115gr FMJ 9mm runs about 1200-fps in the "big" gun and over 1100 in the little one. Same with my reloads: a 115gr Gold Dot over Power Pistol clocks 1250 from the 17 and about 1160 from the 26.

Switching to something that burns more, slower powder (.357 Magnum anybody?) will yield similar results, albeit I've never chronographed a really short .357. But you can't "switch to a faster powder to get your speed" back in the short barrel, nor will it outrun a load using slower powder. A max Magnum load of slow-burning ball powder will always generate more speed than a load using less powder (gas volume).

As far as loading range ammo, my test for my 9mm reloads is to use my weak hand holding with just the thumb, trigger finger and middle finger. If the load cycles with Glock 26 held like this, it's good to go! Having shot a 27, not sure I want to subject myself to this with the .40...

[scccdoc]

Originally Posted by wanderinwalker

Powder burn rate versus barrel length really doesn't matter. Or put another way: max performance of a given cartridge is going to be had with the same powder, irrespective of barrel length.

They're not .40s, but I have chronographed my Glock 17 and 26 side-by-side a few times. On average there's less than 100-fps difference between them. WWB 115gr FMJ 9mm runs about 1200-fps in the "big" gun and over 1100 in the little one. Same with my reloads: a 115gr Gold Dot over Power Pistol clocks 1250 from the 17 and about 1160 from the 26.

Switching to something that burns more, slower powder (.357 Magnum anybody?) will yield similar results, albeit I've never chronographed a really short .357. But you can't "switch to a faster powder to get your speed" back in the short barrel, nor will it outrun a load using slower powder. A max Magnum load of slow-burning ball powder will always generate more speed than a load using less powder (gas volume).

As far as loading range ammo, my test for my 9mm reloads is to use my weak hand holding with just the thumb, trigger finger and middle finger. If the load cycles with Glock 26 held like this, it's good to go! Having shot a 27, not sure I want to subject myself to this with the .40...

You certainly seem more well versed on the subject than I, however I understand that a pistol caliber carbine generates up to 200 ft/sec more than than a pistol. Why is this? Thanks

[wanderinwalker]

Originally Posted by scccdoc

You certainly seem more well versed on the subject than I, however I understand that a pistol caliber carbine generates up to 200 ft/sec more than than a pistol. Why is this? Thanks

Barrel length. A bullet is driven by the expansion of gas when you ignite the powder behind it. The longer the bullet is in a barrel, the more opportunity for the gas to expand and drive it. As soon as a bullet leaves the barrel it is no longer accelerating (no more gas pushing on it) and actually begins decelerating immediately.

Now the reason you can get more speed out of a bigger cartridge (lets use .357 and 9mm as an example here as I reload and shoot both and they operate at similar pressure) is because you have more capacity. It's basically as the hot rodders say "There's no replacement for displacement." A hot 9mm can close the gap on .357 performance with light bullets in the 115-125gr range but can't quite equal it. I've chronographed Winchester 127gr +P+ 9mm spot on 1270 fps from my Glock 17 (4.5" barrel). I haven't bothered chronograph any 125gr .357 ammo from my S&W 586 but I know full-power 158gr loads will easily break 1200-fps from a 4" revolver. That's more bullet weight at higher velocity; I don't doubt the 1400-1500 fps claims with the hot 125gr .357 ammo. Edited to Add: Depending on the powder and load, a 9mm will be burning around 6 grains of powder with a 125gr bullet while a .357 Magnum can hold over 20 grains with the same bullet weight. What you'll note is the diminishing returns: a .357 burns 3x as much powder with a 125gr bullet for less than 1/4 again more velocity.

(Here I will add: I'm not a masochist and have 0 interest in shooting one of the lightweight little .357 revolvers available. Nothing smaller than a 2.5" K-frame for me please.)

Semi-auto rounds have relatively smaller gains in carbines versus a Magnum revolver round. I'm ho-hum about having a 16" semi-automatci 9mm, .40 or .45 ACP carbine. I have however had a couple of .44 Magnum lever carbines and the gains over a 6" revolver are quite noticeable. Usually 500-fps from a 6" to a 20" barrel. Why? The semi-auto rounds burn smaller amounts of faster powder, so you have less potential energy (speed) to gain. Burning more, slower powder the Magnum revolver rounds can make more use of the longer barrels.

(Apologies for the wordiness. It's a peeve of mine when people start suggesting "You can optimize your snubby revolver/short-barrel rifle loads with a faster powder." If you're after max speed, your only choice is to burn as much powder as you safely can and that is determined by the cartridge size and pressure limit, not barrel length.)