Well you have buffaloed me, the "coke bottle effect" is a pretty good sign that your bullets are snug in the brass.
But I repeat, I see little chance that your Clays load was really doing 817 fps. More like 700. No wonder it feels mild.
I don't know about the HS6, I loaded it in 9mm P only for a while but dropped it because it was the only powder I ever found that would foul a gun enough to hang it up in a day's normal shooting. I cannot find any .45 Colt data for it in a real gun.
Suggest you use factory loads for shooting intruders. I don't go along with the usual lawyer scares but there is something unusual going on here and I would not want to go to a gunfight with such peculiar ammunition.
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