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.45 ACP 1911 bullet setback upon chambering

This is a discussion on .45 ACP 1911 bullet setback upon chambering within the Handguns forums, part of the Gun Forum category; +1 on the taper crimp, in a step subsequent to bullet seating. A throated barrel can help, either aftermarket (Clark, et. al.) or hogging out ...


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Old July 2nd, 2013, 07:40 AM   #16
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+1 on the taper crimp, in a step subsequent to bullet seating.
A throated barrel can help, either aftermarket (Clark, et. al.) or hogging out the stock version. Just have it done by someone who knows what their doing.
If hardball works, there's really nothing wrong with it in .45. IMHO, it's more about being able to put 'em where they belong than magic bullets.

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Old July 2nd, 2013, 08:06 AM   #17
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I carried a 1911 as my duty pistol as a police officer for many years and I too noticed the setback in bullets that were chambered and re-chambered in my own 1911 pistols. I never noticed any difference in the point of impact outside of the normal group for those rounds or experienced any reliability issues. During our qualifications or training sessions I would shoot up the rounds I had in my pistol and in the magazines in mag carriers on my Sam Browne belt so I eventually just stopped worrying about it.

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Old July 2nd, 2013, 08:23 AM   #18
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One of the nice things about .45 ACP is that it's not one of the whiz bang hyper pressure cartridges that are susceptible to over pressure from minor variabilities.

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Old July 2nd, 2013, 12:56 PM   #19
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17,500 PSI for the .45 vs 35,000 for 9MM. You will still rupture the Barrel with too many Hot loads in the .45 but it is still more forgiving than the 9MM that may blow up in your face.
This being said there is no reason to accept any setback weather you are shooting Factory or hand loads !
I have never ever had a setback but I do have a Colt! Is this a Springfield thing?

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Old July 2nd, 2013, 01:03 PM   #20
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John,

Ive noticed it in the last 2 1911s ive owned too. its always with factory ball ammo that has been rechambered multiple times. i think most of the ammo ive shot does not have much of a crimp on it.

Maybe its worse in my 1911? I have a habit of clearing my gun a lot for dry firing, etc. And ammo availability being what it is, i cannot afford to shoot it even if i find it. so i guess i end up hanging onto my ammunition longer than i used to. (i did find some 45 at cabelas yesterday and went shooting today, forgot how much i love shooting my 1911, shot a whole 3 magazines!)

I guess ill just have to keep a 2 or 3 time chambering policy per round, or slowly lock my bullets into battery.

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Old July 2nd, 2013, 01:27 PM   #21
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Quote:
Originally Posted by SGT John SWF View Post
I have never ever had a setback but I do have a Colt! Is this a Springfield thing?
More like a cheap crap fmj target ammo thing. (Ever see lumpy plated CCI boolits?) Certain ammo brands apparently don't give a poop about case neck tension/crimps/cannelures for 45ACP target ammo.

I own a Colt 1911 too.

P.S. I just cycled some PMC 45ACP FMJ through both my Colt and Springfield. No setback. Black Hills 45ACP JHP is also good to go with multiple chamberings.

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Old July 2nd, 2013, 01:33 PM   #22
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+1 Colt
+1 Good Ammo

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Old July 2nd, 2013, 01:53 PM   #23
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Whatsinaname181
Silly Laptop ! I Missed your post.
Maybe It is me and I have not been in the habit of re-chambering rounds. For all i know it is a problem I don't know about because I chamber and fire (except for the carry loads I made). My hand loads cannot be relied on as normal as I use a Dillon press where I get a taper crimp with a very slight roll at the top. There is no way I can get a set back.
I have some Winchester factory Ammo and I will ,next time at the Range cycle some 10 times each to see if i can get a reaction.
I wish i could send you some Ammo because I found a supplier that makes nice lead Bullets for a decent price and they shoot Really well.
I hate to see a Gun "down" for lack of Ammo.
John

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Old July 2nd, 2013, 02:07 PM   #24
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45 ACP pressure is nothing to play around with it. I have seen a SIG P 220 turned into scrap metal in one shot. It is not a gun problem in rounds are being pushed back it is an ammo problem. A good round should be able to be pushed on at the back even buy full pressure and not move a bit.

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Old July 2nd, 2013, 04:03 PM   #25
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If you are chambering a round ONCE and getting setback, that is a ammo problem.

If you are chambering the same round 2, 3, 4 times etc and getting setback, that is not an ammo problem.
That is a operator problem, stop doing that. It will come back and bite you in the ass one day in the worst way.
Identify a problem, learn a lesson from the problem, apply what you learn.
Don't keep doing the same thing. Keep your rechambering of rounds on any gun, except maybe a revolver, breakopen shotgun, or bolt action rifle to a minimum.

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Old July 6th, 2013, 11:51 AM   #26
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IDK if it is even still available, but what I used for carry ammo was Federal, target, 230grn ball. Primers were sealed and there was a cannalure crimp that avoided setback.

Bought a case of it back when and still using it.

I also only rechamber twice, max, and then it's range ammo. Constantly rechambering ammo is not the best move you can make.

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Old January 4th, 2017, 02:10 PM   #27
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Dead thread revival!

Disclaimer - I'm not a reloader or expert on anything.

So if you have a round that gets set back, and you fire the round, doesn't the explosive energy push the projectile back toward the case mouth/chamber/barrel and then down the barrel? In a nano-second wouldn't it push the projectile back to the normal OAL and continues sending it down the barrel as the powder continues to burn. I'm just not believing that the setting back of the projectile creates some plug/bond so strong that the pressure would rather bust the chamber instead of pushing the projectile in the normal direction. Especially when the problem is a sliding fit between case and projectile. Even if it was from multiple re-re-re-chamberings I can't envision it.

I understand how a squib would be a problem but that is a full blow plugged barrel.

I think the opposite might hold true - if a bullet could get pushed back far enough to create open gaps between projectile and case neck, some of the pressure created might slip around the projectile and out the barrel ahead of the projectile. In a worst case scenario maybe even resulting in a squib or a different sound/feel between rounds as mentioned in a post above.

Are there tests anyone has done to prove the concept that push back causes kabooms? Or has anyone had a kaboom and found the projectile still set in the ruptured case? Anyone seen a picture of a ruptured case with a projectile still in it? That all just does not seem possible in my mind unless there was a preceding squib.

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Old January 4th, 2017, 03:30 PM   #28
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From what I understand, if the bullet is contacting the lands because it was pushed back then there would be a pressure spike because there is no room for the bullet to jump. If its just pushed back it could cause an increase in pressure because there isn't as much room for gasses to start expanding before having to move the bullet.
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Old January 4th, 2017, 04:22 PM   #29
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Think of it this way. Bullet set back is like an over charge of powder.
Either one is not a good thing!

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Old January 5th, 2017, 06:53 AM   #30
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The bullet push back happens when the round is repeatedly slammed, under spring pressure into the feed ramp during it's transition/journey from the magazine into the chamber. A good polish job to the barrels feed ramp might help to alleviate this problem as well as too increase the weapons overall reliability.

Or not, since I have always polished the feed ramps on all of my 1911's and it still happened occasionally with repeated chambering. Which leads me to believe that ammo quality may be an larger issue... Yet all we used for qualification ammo for our cops carrying 1911s or anything else, was Federal 230 hardball bought under a state bid contract. But a highly polished feed ramp is still a great improvement to any semi auto pistol regardless of manufacturer.


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