Oh no, not another 45acp Case Longevity Test!

GeoDudeFlorida said:
I’ve tried going down to less than fifty thousandths hold, head spacing on the extractor, and the only problem was from setback. Nothing dangerous but it was a little surprising.

Steel and aluminum cases are harder on the extractor than short brass. Age got to the extractor of my Thompson/Auto-Ordnance I have no idea how many rounds it took but I did finally wear one out.

Ol’ John Moses was a genius!
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Yes he was..........

Gaston musta been one also..................can't tell you how many 40 Shorty's came out the end of a G20................................ 😁
 
Soonerpesek said:
Yes he was..........

Gaston musta been one also..................can't tell you how many 40 Shorty's came out the end of a G20................................ 😁
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Friend of mine who was a professional gunsmith accidentally loaded 9mm to test a .40S&W Glock. It took him two full magazines to figure out his mistake. 😳🫣

Ol’ Gaston passed a couple of years back but his legacy, like Brownings, will live on.
 
CQB45ACP said:
I do know that’s what the article said and that was after 54 firings. As for me NO I don’t know but do know of no negative signs.
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Really the only negative sign would be that the spent case stayed in the chamber…

Extractors are inherently strong, most would hold a rim without one knowing…

As with the last test(s), I look forward to your postings….
 
Soonerpesek said:
Really the only negative sign would be that the spent case stayed in the chamber…

Extractors are inherently strong, most would hold a rim without one knowing…

As with the last test(s), I look forward to your postings….
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Hmmmm. Stayed in the chamber. Always or hit and miss? Cause now that I think about it.
 
Soonerpesek said:
They are usually strong enough to hold it to fire and pull it out…
Occasionally it will slip off the rim and leave the case there…
Like I stated a few posts ago, I have fired MANY 40’s out of a Glock chambered in 10mm….
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I should state that I’m not saying for anyone else to do that, just that I have done it…

Don’t wanna get in trouble for suggesting anything “problematically dangerous”……
 
Yay! Another test that I can follow vicariously at no cost to me. Thought I ran through a lot of 45ACP but having a couple gallons of them to cycle through I have probably only fired them 10 times or less so far. And I did not sort or case prep any, just used em as range pickups to load.
 
CQB45ACP said:
Right and the age-old boogeyman, "headspacing on the extractor", hasn't presented itself to me nor the Florida Reloading author.
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"The under .890s go in a "don't use" container. I do that for all my brass. Just do."

Perhaps this is the reason why? 1911 45 acp rounds can headspace on the rim, the extractor or the bullet (lead target rounds). And perhaps which one is doing the headspacing is dimension dependent? Maybe there is an actual test?
 
zeke said:
"The under .890s go in a "don't use" container. I do that for all my brass. Just do."

Perhaps this is the reason why? 1911 45 acp rounds can headspace on the rim, the extractor or the bullet (lead target rounds). And perhaps which one is doing the headspacing is dimension dependent? Maybe there is an actual test?
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Okay, start testing!
 
Most of the 1911's I've looked at the extractors were longer than spec. So the likely hood of extractor holding the live round is very rare, when they have an extra 0.010" reach. Some even hit the extractor groove tilting the round. Most custom builders have to correct the error or replace it with the FP block in the correct position.
 
Short cases may not pass the plank test. Then headspace will be on the bullet ogive.

all 45 acp case walls start thickening right at .060" down from the mouth (i used a ball mic to check a variety of case manufacturers). I use that as an automatic setback "stop" for longer skirted bullets. that may be useful in your testing.

luck,

murf.
 
murf said:
Short cases may not pass the plank test. Then headspace will be on the bullet ogive.

all 45 acp case walls start thickening right at .060" down from the mouth (i used a ball mic to check a variety of case manufacturers). I use that as an automatic setback "stop" for longer skirted bullets. that may be useful in your testing.

luck,

murf.
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I've never found a problem caused by shortening cases per se--not in last test anyway. Nor did author of Florida Reloading article. Neither did he see the mouth thickening.

Fortunately, I'm just after a simple longevity test and am confident (but not prejudging) my primer pockets will shorten too much once again and thus determine longevity.
 
Granted, almost all my experience is dated. But one of the reasons i started sorting 45 acp brass was because the rp 45 acp brass was measurably thinner/shorter than all the others. They also seemed to lose what little elasticity they had after one firing, which i interpreted as their brass being "harder" . So sorted them out to only use with target loads using full dia lead bullets. Will be interesting to see them subjected to some testing.

edited cause forgot the shorter
 
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CQB45ACP said:
I've never found a problem caused by shortening cases per se--not in last test anyway. Nor did author of Florida Reloading article. Neither did he see the mouth thickening.

Fortunately, I'm just after a simple longevity test and am confident (but not prejudging) my primer pockets will shorten too much once again and thus determine longevity.
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Not the mouth, but .060" below the mouth. makes a great place to seat the base of the bullet. alas, most bullets don't seat that far down.

murf
 
zeke said:
Granted, almost all my experience is dated. But one of the reasons i started sorting 45 acp brass was because the rp 45 acp brass was measurably and thinner than all the others. They also seemed to lose what little elasticity they had after one firing, which i interpreted as their brass being "harder" . So sorted them out to only use with target loads using full dia lead bullets. Will be interesting to see them subjected to some testing.
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I'll try to pay attention to lost elasticity--in a layperson's kinda way.
murf said:
Not the mouth, but .060" below the mouth. makes a great place to seat the base of the bullet. alas, most bullets don't seat that far down.

murf
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Oh, ok. Now I know I really won't be watching that. How do you measure that?
 
CQB45ACP said:
I'll try to pay attention to lost elasticity--in a layperson's kinda way.
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as the way it appeared to me. Mostly by setback with loaded jacketed rounds, even after resizing down further cause thinner brass, That and more inconsistent velocities. Neither of which are very scientific.
 
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