.45 ACP 1911 bullet setback upon chambering - M14 Forum

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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; Its never seemed an issue, but I have a tendency to chamber rounds multiple times in my 1911. Cleaning, etc. after a while the projectile ...


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Old July 1st, 2013, 08:45 PM   #1
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.45 ACP 1911 bullet setback upon chambering

Its never seemed an issue, but I have a tendency to chamber rounds multiple times in my 1911. Cleaning, etc. after a while the projectile gets further and further set back. I fire them, and never seemed to notice a difference, but can this create excess pressures that can damage the pistol?

How much over pressure is the 1911 rated for?

Ive read that high pressure tests reveal M14s are well up into the 100,000 range ( at least 3x higher than 762x51 produces).

More of a curiosity than anything.

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Old July 1st, 2013, 08:57 PM   #2
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It can cause the pressure to rise. Tighten up your crimp and that should help the setback problem. Or start chambering them a little easier

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Old July 1st, 2013, 09:10 PM   #3
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I don't know how much the pressure increases so I try to keep track of which round has been chambered and fire it first when I do shoot. Multiple chamberings are a concern of mine as well. "T"

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Old July 1st, 2013, 09:46 PM   #4
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I have been told to not chamber the same round more than a few times for that very reason. Though you can consider the fact the 45acp is low pressure anyway and the pistols firing the 45 acp can handle more than double the pressure you should be fine if a projectile sets back from to many chamberings. A few times I noticed a round that was way stout and I attribute it to set back since they were factory and not re-loads

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Old July 1st, 2013, 10:42 PM   #5
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I "solve" this "problem" myself by just hand inserting the first round into the chamber and then hand setting the slide in behind it then inserting a full magazine underneath the closed slide.
...
What I worry about is after I've done this a while if there might be a "dent" in the top cartridge in the magazine from being pushed in below the slide over and over.
I've never had a problem yet but there always seems to be something to worry about.
...
If you're handloading I'd probably get a Lee Factory taper crimp and just crimp into the side of the projectile lightly and let that keep any setback in check.

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Old July 1st, 2013, 10:47 PM   #6
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Quote:
Originally Posted by D308FAM View Post
I "solve" this "problem" myself by just hand inserting the first round into the chamber and then hand setting the slide in behind it then inserting a full magazine underneath the closed slide.
...
What I worry about is after I've done this a while if there might be a "dent" in the top cartridge in the magazine from being pushed in below the slide over and over.
I've never had a problem yet but there always seems to be something to worry about.
...
If you're handloading I'd probably get a Lee Factory taper crimp and just crimp into the side of the projectile lightly and let that keep any setback in check.
I have been told that manually inserting rounds into the chamber is bad for the extractor, being that the M1911 is extractor is designed to have the rim of the cartridge slide up and underneith the extractor, rather than snapping over the top of the rim. I could be all wet about this...


Yes, all i shoot at the moment are ball factory loads. My springfield hates anything that is not shaped like an FMJ.

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Old July 2nd, 2013, 12:42 AM   #7
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Quote:
Originally Posted by Whatsinaname181 View Post
I have been told that manually inserting rounds into the chamber is bad for the extractor, being that the M1911 is extractor is designed to have the rim of the cartridge slide up and underneith the extractor, rather than snapping over the top of the rim. I could be all wet about this...


Yes, all i shoot at the moment are ball factory loads. My springfield hates anything that is not shaped like an FMJ.
Good Point.
I don't worry about the gun parts as I can always get another...but just one high pressure round is a really, really bad day.
It might be interesting to see what data looked like with the normal round OAL and with the "pushed in" projectile rounds on some ballistic software. Even thought it would only be a guess as the powder would be unknown...at least maybe order of magnitude outputs would be of interest?
About how many thousandths of an inch push-in are we dealing with?

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Old July 2nd, 2013, 01:12 AM   #8
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The pistol may take higher pressure (think LAR Grizzly as an extreme), but it's often the cases that let go around the feed ramp. This especially in those pistols that have been throated for more reliable feed. The web of the .45 ACP case isn't especially thick, so if it's unsupported it will blow out if pressures are high. Can make a mess of your hand, not to mention busting grips and swelling the frame in the mag well area. (Metal grips were fairly popular at one point as added protection for the race gun crowd!)

Having the bullet deeper in the case often isn't a problem even though it does raise pressure- until it is! Reloaded cases particularly.


Last edited by jmoore; July 2nd, 2013 at 02:02 AM.
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Old July 2nd, 2013, 03:26 AM   #9
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What brand of 230 Gr Ball are you shooting?
Did this setback problem just start or did your Springfield always do it?
How much setback?

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Old July 2nd, 2013, 04:23 AM   #10
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Dropping the slide, on a 1911 pistol will only kill your extractor. Things tend to fail at the most inopportune times.

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Old July 2nd, 2013, 05:07 AM   #11
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Quote:
Originally Posted by valken View Post
Dropping the slide, on a 1911 pistol will only kill your extractor. Things tend to fail at the most inopportune times.
I think that's dropping the slide on a manually chambered round, will only kill your extractor.

Don't repeatedly rechamber the same round, setback can cause very high pressure and even seriously damage the gun if a blow out occurs.
I always move a previous unchambered round into the first round position if for some reason I have to unload the gun and then reload it.
I move the previously chambered round into the second round position

If your having setback issues with .45 acp reloads, set your taper crimp to .470 - .469.

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Old July 2nd, 2013, 05:22 AM   #12
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I was given 4 boxes of factory .45acp made by Independence ammo company that seemed to shoot funny... till I had to unload my pistol while at the range and discovered the bullets were getting pushed back into the shell. Not just one or 2, but all of them. Factory ammo that wasn't crimped! Whoda thunk it?!

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Old July 2nd, 2013, 06:03 AM   #13
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Why are you chambering rounds when cleaning? If you're cleaning the pistol, the last thing you want to do is get distracted, forget about the round in the chamber and drop the hammer.

+1 for a good taper crimp. Usually solves setback issues.

Bruce

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Old July 2nd, 2013, 06:19 AM   #14
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Funny you mention it, but I had some vicious setback last Sunday in my Springfield Loaded 1911. I shot up a box of old (2006) CCI Blazer, and the first clue I had that something was f'ed up was a FTF upon chambering. I dropped the mag, then ejected the half chambered round. Setback appeared to be 3-4mm. Sooo, being the smart man I am, I rechambered by using the slingshot method instead of the slide stop. The rest of the box fired fine, but inconsistantly with some rounds recoiling a little more than others. In the past, I have reserved such crappy 45ACP rounds to my Ruger Old Vaquero convertible 45ACP/45LC, since it has a reputation for being able to digest thermonuclear loads. Upon cleaning and inspection of the 1911, I noticed no damage to my 1 piece barrel, or any unusual wear to the rest of the pistol. That CCI had the worst setback I have ever seen. Ideally, ALL factory ammo should have a cannelure. Federal Hydrashock and American Eagle 45ACP have noticeable cannelures. Other brands seem to rely on case neck tension, and with soft brass it aint enough.

http://www.corbins.com/hct-1.htm

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Old July 2nd, 2013, 07:24 AM   #15
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Quote:
Originally Posted by Diablo Gato View Post
Funny you mention it, but I had some vicious setback last Sunday in my Springfield Loaded 1911. I shot up a box of old (2006) CCI Blazer, and the first clue I had that something was f'ed up was a FTF upon chambering. I dropped the mag, then ejected the half chambered round. Setback appeared to be 3-4mm. Sooo, being the smart man I am, I rechambered by using the slingshot method instead of the slide stop. The rest of the box fired fine, but inconsistantly with some rounds recoiling a little more than others. In the past, I have reserved such crappy 45ACP rounds to my Ruger Old Vaquero convertible 45ACP/45LC, since it has a reputation for being able to digest thermonuclear loads. Upon cleaning and inspection of the 1911, I noticed no damage to my 1 piece barrel, or any unusual wear to the rest of the pistol. That CCI had the worst setback I have ever seen. Ideally, ALL factory ammo should have a cannelure. Federal Hydrashock and American Eagle 45ACP have noticeable cannelures. Other brands seem to rely on case neck tension, and with soft brass it aint enough.

http://www.corbins.com/hct-1.htm
I've had Federal Hydra - shok crimped at .473 and had noticable setback after one chambering. One reason i switched to Rem Golden Sabre .470 crimp.

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