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Case inspection of 547 used cases

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David Milisock View Drop Down
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    Posted: Nov 13 2022 at 4:29pm
I just polished up and inspected a bunch of used cases, 547 to be exact. They had all been fired, NEVER TRIMMED, some, 150 fired 4 times, some 3, the bulk, over 200 fired 2 times, and some fired 1 time.

Cases were mixed stamps, FC, PMC, Winchester and Remington. After polishing and inspection 1 case from the 2 times fired bunch had a split and was trashed. 

Most cases,  over 350 , measured between 1.275 and 1.268. The balance none measured more than 1.279.
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floydthecat View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote floydthecat Quote  Post ReplyReply Direct Link To This Post Posted: Nov 13 2022 at 4:39pm
Size them and check before you cull any for short length.
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David Milisock View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote David Milisock Quote  Post ReplyReply Direct Link To This Post Posted: Nov 14 2022 at 9:59am
Great minds think alike! 😃😃

I took a sampling of 10 of the shortest and ten of the longest and ran them through my RCBS carbide dies, they all grew, nothing moved more than .0015.

Amazing how the manufacturers are cutting the cases short.  The action of the 30 Carbine not holding the bolt forward with any spring tension requires either that the extractor hold the rim in place or that the firing pin be long enough to take up the slack of minimum length cases.

I've seen the same with 45ACP, I literally have never seen a 45 case the proper length.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote floydthecat Quote  Post ReplyReply Direct Link To This Post Posted: Nov 14 2022 at 10:26am
I don’t make it a habit and do toss brass much below 1.285 after sizing, but I have had commercial junk that would continue to function at head space out to 1.311 or so. The 30-carbine is often touted as a pistol caliber and will behave much like 9mm and 45acp….lose. The shorter the brass the longer the head space, but I never had a case rupture. It will usually just stop firing if the brass gets too short. I don’t know of anyone ever producing proof of a case rupture not related to faulty ammo. Use good brass and it’s highly unlikely…..it will just stop shooting if it gets too short.
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David Milisock View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote David Milisock Quote  Post ReplyReply Direct Link To This Post Posted: Nov 14 2022 at 12:49pm
I'm just going to load all of them, like I said some have already been fired 4 times. 

You know once fired brass that's already too short after the first firing didn't shrink when I fired it. I wonder just how short it was to start?
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Smokpole View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Smokpole Quote  Post ReplyReply Direct Link To This Post Posted: Nov 14 2022 at 10:18pm
Guys, keep in mind that the carbine round is a tapered case. In a moderately snug chamber, friction fit will often prevent a case from going all the way forward and will snug up tight enough to hold the round far enough back for the firing pin to hit the primer hard enough to set it off. Back pressure will reseat the primer when the round fires. Of course some case stretching will occur, but it is usually such a small amount that unless you are keeping track of that single case, you won't ever notice it. That is one of the beauties of a lower pressure round.
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David Milisock View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote David Milisock Quote  Post ReplyReply Direct Link To This Post Posted: Nov 15 2022 at 9:42am
Agreed, the only issue is carbon build in the chamber a sloppy wet patch and bronze brush has kept that problem at bay for me.


David Milisock
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