Glock 37 .45 GAP

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The other downside now is, they use a small pistol primer. Not a big deal, but with the primer situation now, its not optimal. Ive been burning through my small pistol primers at their normal rate for other things, and have had to slow that down a good bit. I have plenty of large pistol primers and now a 45 that wont take them. Go figure. :)

Couldn't you just shorten the brass case from a 45 ACP and use your large pistol primers? Or am I missing something?
 
Couldn't you just shorten the brass case from a 45 ACP and use your large pistol primers? Or am I missing something?
From what Ive read, my understanding is no, and in a couple of respects.

One, apparently, the 45 GAP cases are built differently dimention wise and made to handle the higher pressures, and have some rim differences.

Trimming the ACP cases causes bulging and crimping problems with bullet seating due to tapering wall thickness.

I also seem to remember something about the ejectors being designed for the small pistol primers, but Im not sure how that would work. Unless theres a worry of unloading a loaded round.

If it were all I had, and I had to make it work, I might put more effort and/or care into it, but thats not a issue.
 
Bad idea.... .45 GAP has thicker case walls.
The pressure is not that much higher than .45 ACP. 45 GAP is more along the lines of of +P ACP load and other than the headstamp .45 ACP +P brass is no different than standard ACP brass is. It's not a guarantee that if someone used shortened ACP brass that there would be a blowout/ head separation, the GAP's thickened head walls were done to reduce the potential for one.

Thus, there is a higher chance of having a case failure, but how much higher of a chance is unknown.

If someone wanted to trim once fired ACP brass down to GAP length and use it, I wouldn't stop anyone from trying it, just that that I wouldn't trust those cases beyond a few reloads. Also, it doesn't mean that when loading the reloader must load it to the 23k PSI limit,in fact, looking at Hodgdon's online reloading data, a max charge of CFE pistol powder doesn't even exceed .45 ACP's SAAMI max of 21k PSI with a 200gr bullet.
 
I purchased some when the GA SP changed over, 2 came with 300rnds and 3 mags the other came with 1000rnds and 2 mags. I reload mine using 180gr and 200gr nothing very hot, you can load them to 45acp specs partly due to the case design. A LGS had lawman ammo for $10 a box and 10% discount on 10 boxes so about the same price as 9mm at the time.. They make great truck/motorcycle gun (they don't rust like a 1911) I had one of mine gone through and he said it hadn't been shot a lot and the last one looks like it hadn't been issued.
 
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