Just to see the differences between what I'm shooting and the +P you found (THANKS!):
Winchester
Muzzle Velocity: 1190 fps
Muzzle Energy: 362 ft. lbs.
Black Hills +P
Muzzle Velocity: 1300 fps
Muzzle Energy: 431 ft lbs
It appears that the muzzle energy difference is more than enough to change the way the slide retracts and the rds feed.
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