I do not have a .45 lightning; but have a friend that bought one of the AWAs in .45 when they first came out. He never shot BP through it; but after a couple hundred rounds of smokeless rounds, it required a complete teardown and detailed cleaning, lubing and tightening of screws. I would guess that the blowback from a straight walled case would gunk up the action a lot quicker than that causing feeding and ejecting problems. My 44-40 Lightning will go 4-500 rounds before it starts acting up and requires a good detail cleaning.
The original Lightnings were not made in straight walled case calibers. Might be a reason for that.
Of course, the above is only my opinion. Someone with experince using .45 BP loadings may have a differing opinion.
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