as far as any concerns about any greater difficulty in staying in the 10" chest circle, if the .45 is fired in a full size and wt 1911.; Same .18 second average times. Just a bit more tension in the hand and the Weaver-isometric, that's all. the reason guys "think" it's so vital to practice with same recoil as carry load is that they are STUPID about the ranges at which civilians have to fire. Sure, there's a difference at 20 ft, and quite a bit of diff at 30 ft, but 20 ft is a one in 100 fluke, and 30ft is one in 1000, for justfiable civilian self defense. 90% of the time, you dont have to fire at ALL, or a MISS suffices. 90% of the remainder of the time, it's at 10 ft or less. So 10 ft covers 99% of it. No, I AINT wrong about this. YOU are, and you're dumb to be SLOW at the ranges that MATTER (ie, 6ft and less).