The Why is ......The mfg's did that ( put small primer pockets in .45 acp cases ) ...because the primers are Non Toxic..../ that's why the cases are marked " NT " ... or lead free primers...( I don't know if it accomplished anything .....other than raising the cost of ammo )....
Personally, I just toss them out - when I find any NT cases in .45 acp ....and don't fuss with them.
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