Back in the early 80's I was shooting a 9mm Major, in a Colt 1911, with a standard barrel (non-ramped).
A couple of times I had case heads blow, which will mess with the mag. If the mag is full it'll blow it out, sometimes firing the top round in the mag too. If the mag is less than 1/2 full, it's usually OK because the gas just shoves the rounds down into the mag.
The first time it happened I had checked wood grips, and thankfully it was just a blow-out; but it took me quite a while to pick all the slivers out of my hand, and of course it wrecked the mag. The next time I was using Pachmayer grips, with the steel inserts. This was just after a mag change and it set-off the top round in the mag. It sure made my hand sting and tingle; but by the time I'd hammered out the ruined mag and 'massaged' the grips back into a useable shape, I was fine to keep shooting.
Then I changed to a P35 (BHP) with its fully supported chamber and never had another blow-out.
So I converted that 1911 to .45 ACP, and I was fairly happy until I stumbled on to a stash of steel .45 cases made in '42 or '43 as I recall. These bad-boys let me do some pretty stupid stuff in that stock Colt barrel. 230 grain FMJs at nearly 1300fps! It'd pierce the odd primer but the cases were just fine.
Those cases were a distinctive 'white' steel colour, very easy to distingush from the brass cases that .45 had.
Until the time I found my first nickel plated .45 case.
I didn't realize it wasn't part of my batch of steel cases, and it wrecked another mag, and completely finished those old Pachmayer grips when it went off.
After I discovered the problem, I used cold-blue to make the steel cases even more distinctive.
I've never done anything like that with a rifle; but when I was searching for a good load for my 788, in .308, using the 190 grain BTSP I did have a few loads that needed to have the bolt opened with a rubber mallet.
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"Those who have long enjoyed privileges as we enjoy, forget, in time, that men have died to win them."
Franklin D. Roosvelt
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