And now, the update...
Hi-Power worked great, but the cheap mags I'd bought were crap...
Security Six worked great with everything from my wadcutters all the way up to my full-bore 150grn JHP magnum loads.
American 9mm did really well, but I still couldn't get the laser sighted in right.* It was just a slight bit left.* I made an adjustment and then didn't know where it was hitting.* Still needs some work.
Didn't get to shoot the American*.45acp
My Kahr MK9 loves the Critical Defense rounds, so they're my new carry ammo.