Chamber depth .45 acp

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Post by james r chapman on 5/26/2019, 6:50 pm

What would be the optimum chamber depth for a match barrel? 
My factory match ammo seems to drop .010-.014 below the hood.
I’m trying to sort out ignition problems

Chamber depth .45 acp 8bbae710
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Post by Wobbley on 5/26/2019, 7:02 pm

Get a case, measure it, and drop it in until it stops. Then measure to the back face of the hood to the rear of the cartridge. That measurement plus th3 measurement of the case is the “headspace” of the chamber. (Ish, sorta).

If your match ammo is taller than what you measured with the empty case it is headspacing on something else (bullet most likely). In any event if this round below hood is more than .010 or so. It might cause ignition issues but from what I can see in the photograph, it might be something else. Many chambers in 45 ACP are long.
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Post by Jon Eulette on 5/26/2019, 7:03 pm

Most smiths build/chamber to 0.905. Assuming zero tolerance between breechface and hood.
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Post by Jon Eulette on 5/26/2019, 7:05 pm

Check your overtravel. If hammer half cock is hitting sear it will cause erratic ignition.
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Post by james r chapman on 5/26/2019, 7:58 pm

Thanks.
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Post by Jon Eulette on 5/26/2019, 8:07 pm

Jim, what kind of pistol is it?
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Post by james r chapman on 5/26/2019, 8:32 pm

Jon Eulette wrote:Jim, what kind of pistol is it?
Jon
pm sent.
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Chamber depth .45 acp Empty .45 ACP Match Chamber

Post by Richard Ashmore on 5/28/2019, 6:45 pm

james r chapman wrote:What would be the optimum chamber depth for a match barrel? 
My factory match ammo seems to drop .010-.014 below the hood.
I’m trying to sort out ignition problems

Chamber depth .45 acp 8bbae710
See the drawing on page 57 of https://saami.org/wp-content/uploads/2019/02/ANSI-SAAMI-Z299.3-CFP-and-R-Approved-2015-12-14-Posting-Copy.pdf
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Post by james r chapman on 5/28/2019, 7:29 pm

Looks like the chamber is well within match specs.
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