[LeGrande]

According to my Speer manual 5th Edition, a .45ACP fired from a Freedom Arms Model 63 Casull, a 230 FMJ with 5.3 grains of Unique gives 900 fps. A Colt Gold Cup, firing the same bullet with 5.7 grains of Unique gives 750 fps.

Isn't that a 6 inch barrel vs a 5 inch barrel? I think that barrel length is by far the most important part of this discussion.

[ol' hoghead]

"Isn't that a 6 inch barrel vs a 5 inch barrel?"

Oops, the revolver was 7.5 in vs. 5 for the auto. Apples and oranges. Comparing a .45 auto rim fired from S&W 625 to an ACP fired from a Gold Cup, both fired from a 5" barrel. AR, 230 grain fmj, bullseye 5.4 grains at 800 fps, ACP 230 gr FMJ bullseye 4.6 grains at 800 fps. Using W231 with same bullet, AR 6.3 grains at 800 fps, ACP 5.4 grains at 800 fps.