Quote:
... the brass cases were from 4 or 5 various makers.
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Well, this is obviously reloaded ammo, so reports of Ultramax off-the-shelf don't help much.
There is no way to predict the behavior of reloads with no knowledge of their history or the practices of the reloader.
FWIW, I find reloads I know nothing about and I get my trusty impact bullet puller and salvage the brass. Throw the powder out in the grass and punch the primers out. Start over.
A damaged pistol is a high price to pay for a box of unknown reloads.
Moving this one to
Handloading, Reloading, and Bullet Casting.
[Edited to add: CORRECTION. After further searching, it seems Ultramax is sold as remanufactured ammo. I was unaware of that little detail. Let's leave it here for now. - Bud]