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Old 07-23-2013, 09:10   #126
ctious
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That spread seems off to me. The speed with the 185 with the 8.6 gr 800x is way faster with the glock29 than I hit with even more powder. The ccu speed sounds close to right. But the 29 way fast.

I will try to hit the range today with the chrono to get some speeds again.
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Old 07-23-2013, 12:23   #127
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Quote:
Originally Posted by ModGlock17 View Post
I think every piece of the puzzle helps. Thx.

This one seems to show the slower HS-6 gives the better improvement in the CCU vs G29 (stock barrel?).
Extended length barrel on the G29--the 4.09" I think it is--about 1" longer than stock in any case.

It is possible, I suppose, that at these very short barrel lengths, a 1" increase in length makes a far bigger difference than it would between say a 12" and a 13" barrel. I dunno.

It was explained to me that because 800X is relatively faster than HS-6, barrel length has less impact with the faster powder relative to the slower one. I personally find that explanation both intuitive, and suspect. But, I felt the comment was coming from someone who knows quite a helluva more than I do, and the data supported it. I apologize again: I'll make a more serious effort to find out where I posted the original...could've sworn it was here somewhere.

I expect the short-barrel data is correct because it was very consistent--no blast effect indications and I did in fact place the chrono well outside of 10 ft--closer to 18 actually. Each charge was hand trickled and I'm confident I didn't mis-label it..it really is 8.6gr, although that's the more likely source of any error.

Next time I'm out I'll do a stock vs extended test on the 29--I'm interested to see just what 1" of barrel length does do with various loads. I doubt it explains "way off" though.

Last edited by Bongo Boy; 07-23-2013 at 12:25..
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Old 07-23-2013, 14:38   #128
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I tested some loads today. In the 29, 20 ls , and the ccu.


155 xtp 11g 800x.

29-1370
20- 1540
Ccu- 1850.
The 155 really gets moving in the long barrel.

9.7 gr 800x 200 gr shallow hp.

29, 1230
20- 1380
Ccu- 1610

Now this was odd to me cause that is a really low speed to what I was getting in cooler weather. But it will kinda make sense in a sec

194 gr deep hp. 8.7 800 x

29- 1260
20- 1450
Ccu -1690

Seems there is a hard break in performance from the 194 to 200 gr. I think 190 is the perfect 10mm weight. After 190 it starts dropping hard.
Adding more powder seemed not to make up for the difference. Starting to think.in the long barrel 200 gr can only go so far with 800x.

Also I do not know to what effect the temp had on my loads. It's 40 deg warmer than when I first shot the one loads. And the speeds are slower. I still wonder about 2400 in the ccu. I just don't have any. And aa9 is no where to be found.
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Old 07-23-2013, 14:39   #129
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Also the drop could also be from it being a blow back and the 200 gr with a hot charge gets the bolt moving early. Not sure yet. Kinda want to block it into place and see what speed I get once.
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Old 07-29-2013, 01:22   #130
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I want that for my 20..!
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Old 07-30-2013, 22:25   #131
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9.7 gr 800x 200 gr shallow hp.
So, at nearly 2 full gr over published max, you're not seeing much in the way of case damage or primer blowout at all?
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Old 07-30-2013, 23:00   #132
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So, at nearly 2 full gr over published max, you're not seeing much in the way of case damage or primer blowout at all?
I am only 1 gr over hornady max for and xtp. These are hard cast. So I am probably only a few tenths over a book max for the hardcast. If there was a book load for it.

I am seeing zero issues. Even in brass that has been loaded and shot 4 to 6 times. Headstamps look good. Primers are not an issue. Very minor flattening. No more than I see on the 9.2 longshot with 180 load. No smiles. Clean out of the ccu and longslide.

My lot of powder must be lower pressure than some of what u guys have.
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Old 07-31-2013, 07:48   #133
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What manual are you using for that XTP load reference?

Last edited by Bongo Boy; 07-31-2013 at 07:48..
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Old 09-03-2013, 15:31   #134
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What manual are you using for that XTP load reference?
Hornady.
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Old 09-03-2013, 15:37   #135
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So had an incident today with the ccu. Had a mis feed. I pulled the charging handle back hard to clear it and cycle a new round. And it went bang. It fired the round while almost all if it was out of the chamber. Gun is fine. Case blew out the side. Banged my hand up a little. But no real damages. Seems that a firing pin safety would have prevented this. Might need to talk to mechtech about this.
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Old 09-03-2013, 17:10   #136
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So had an incident today with the ccu. Had a mis feed. I pulled the charging handle back hard to clear it and cycle a new round. And it went bang. It fired the round while almost all if it was out of the chamber. Gun is fine. Case blew out the side. Banged my hand up a little. But no real damages. Seems that a firing pin safety would have prevented this. Might need to talk to mechtech about this.
I'm thinking that it's not supposed to do that.
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Old 09-03-2013, 17:26   #137
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I'm thinking that it's not supposed to do that.
Lol. I was thinking that also. Scared the crap out of me.
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Old 09-03-2013, 17:35   #138
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So had an incident today with the ccu. Had a mis feed. I pulled the charging handle back hard to clear it and cycle a new round. And it went bang. It fired the round while almost all if it was out of the chamber. Gun is fine. Case blew out the side. Banged my hand up a little. But no real damages. Seems that a firing pin safety would have prevented this. Might need to talk to mechtech about this.
I'm thinking that if the charging handle is not fully forward, the pin gets no cocking to snap forward. Glock design would require a trigger pull to push the firing pin back before it could snap forward. So I don't know how the firing pin can get enough forward energy to strike at the primer. .???

If the firing pin is stuck forward (dirty or whatever), then the case wouldn't slip into the extractor. I am curious if the case is disintegrated or whether you can see if there's evidence of a firing pin strike on the primer ??? Unless your finger was squeezing the trigger while racking the handle, then misalignment and slack may contribute...

Last edited by ModGlock17; 09-03-2013 at 17:56..
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Old 09-03-2013, 18:39   #139
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I'm thinking that if the charging handle is not fully forward, the pin gets no cocking to snap forward. Glock design would require a trigger pull to push the firing pin back before it could snap forward. So I don't know how the firing pin can get enough forward energy to strike at the primer. .???

If the firing pin is stuck forward (dirty or whatever), then the case wouldn't slip into the extractor. I am curious if the case is disintegrated or whether you can see if there's evidence of a firing pin strike on the primer ??? Unless your finger was squeezing the trigger while racking the handle, then misalignment and slack may contribute...
No trigger pull. Hand was clear of that. Yes the primer was struck. Not as hard as normal. But hit enough to set it off. My thought is that it was forward enough to catch it and when I racked hard it might have been enough movement to release it. I am not sure. Gun shoots fine yet though.
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Old 09-03-2013, 18:41   #140
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The way the frame mounts could have enough flex that when I pulled hard against it racking it. To drop down enough to lose the end of the firing pin.
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Old 09-03-2013, 18:58   #141
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Honestly I am kinda going with this being a freak thing. I have shot well over 1500 rounds with no issues.
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Old 09-04-2013, 15:11   #142
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Finally got some aa#9. Can't wait to see what I can get it to do in the ccu.
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Old 09-07-2013, 12:16   #143
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So had an incident today with the ccu. Had a mis feed. I pulled the charging handle back hard to clear it and cycle a new round. And it went bang. It fired the round while almost all if it was out of the chamber. Gun is fine. Case blew out the side. Banged my hand up a little. But no real damages. Seems that a firing pin safety would have prevented this. Might need to talk to mechtech about this.
yep, dangerous design flaw, needs to be fixed!
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Old 09-07-2013, 16:02   #144
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The way the bolt is designed, the firing pin/striker is "free floating" but still "sprung", and there is no safety on it. So, conceivably, if you whack that bolt back hard enough the striker is going to keep going back when the bolt itself stops... then that striker is going to fly forward... BANG. But what is strange is that the ejector didn't kick the round out before the striker flew back forward and struck the primer. But, then again, maybe there is also a problem with the ejector.

I've had 'slam fires' with hot 10mm ammo... but then i've got one of the first units. The bolt would bounce so hard against the rubber recoil buffer that it would throw it back forward so hard the striker would whack the chambered round... and do it again... and again. Kinda freaked me out. So i immediately pulled it off my frame, bagged it, and tagged it, until i could figure out how to fix the problem. What i did to try to fix it was stretch out the striker spring a bit to increase the resistance to forward striker motion, and i plan on setting up the buffer so it doesn't "bounce the bolt". I'm not sure if i fixed it... i still need to test it.

I agree, though, the bolt needs a plunger type safety on the striker.
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Old 09-07-2013, 18:25   #145
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It's hard for me to imagine the bolt would go back, bounce off recoil buffer, then go forward to pickup a new round so fast, way before the striker can return to neutral position.

Then this possibility came to mind: MT warned that during disassembling, if you let the contracting recoil spring SNAPs, you've ruined it. That recoil spring keeps the bolt from slamming so hard at the back buffer.

I have spares of them. Ruined one. Compare them, there's obvious deformity.

I also had made addition foam absorbers next to the plastic buffer, about half inch of hard foam. The motivation was to soften the recoil kickback, as well as keeping the striker pin's locking washer from flying off. It may have helped solve an unintended issue here.
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Old 09-07-2013, 19:07   #146
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MT warned that during disassembling, if you let the contracting recoil spring SNAPs, you've ruined it.
Could you clarify this? I don't quite understand it. I'd love to see some pictures, also, if you can. I've never totally disassembled the unit or even the bolt. The only thing i've really done anything with is the striker spring in the very rear.

The ammo i was using was the Corbon 180 grain JSP rated at 1350 fps. Also, i think some hot Hornady.
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Old 09-07-2013, 19:43   #147
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In the manual I had downloaded from MT website before purchase (wanted to check it out before buying), on bottom of p.15

"...maintain control over the recoil spring. If the spring should slip off the post and 'snap' closed, the spring will be deformed and should not be used again."

It's near Fig. 8.

My 180gr with 9.0-9.3gr LS is fairly warm and would go past 1,300fps on a 6" KKM.

In addition, What we'd need is user experience on how often to replace the spring if shooting hot loads. Ctious is doing hot loads past 1,000 rounds (?). At some $12 a spring, I'd just change it near that count... Mine is probably close to 500 rounds.... I'll find the old spring if I still have it, when I get a chance from honey-dos. Cheers.
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Old 10-15-2013, 10:32   #148
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So yesterday went shooting. Took my dad. Sighted in deer guns. I was shooting my ccu. With 200gr shallow hp loads. I was doing a 3in group at 100 yards. I was happy. I let my dad shoot it. He shot 4 rounds after shooting other stuff at the bull. I told him its a 3 to 4in gun at 100 yards. His response was bs. He then holds his hand up showing a quarter size for a group. I said yeah right. We walked up there. I look. He did not shoot a quarter group. He shot a dime group. 4 shots all cutting in the hole together. I could not believe it. So the gun shoots way better than I thought. After a little questioning I think I figuredout how he did it. I have to float my head up to see through the scope. He was able to lock his jaw off on the stock. So I think he was consistent where I float some. I ordered parts to bring the scope down some and also to raise the stock some. I think this should allow me to lock down on it really well. Can't wait till the parts get here. This may become my favorite target gun. Lol. Who knew a pistol cal carbine could shoot so well.
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Old 10-15-2013, 10:34   #149
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The load was 8.2 longshot with the 200 gr cast.
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Old 10-15-2013, 10:41   #150
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Quote:
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The load was 8.2 longshot with the 200 gr cast.
Great load for XTP's too .... super accurate even from my G29
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