I had the same question...since the .45 ACP headspaces on the case mouth how can a .45 ACP be safely fired in a Roland chamber. This would be like trying to shoot a 9mm in a 9x23 Winchester chamber.
Anyone here shoot a .45 Super? Same size case as the ACP but thicker brass.
Bob
I shoot 45 Super and absolutely love it. A 185 at 1300. FPS + a 230 at 1100 FPS + and a 255 hard cast at 1075 to 1090 FPS. I shoot 45 ACP, 45 acp +P and 45 Super without a hitch and changes to my 1911 from one to the other.
I find that the 45 Super is a significant step up from a +P 45 ACP.
Same here Bob...
I had Jack Huntington set my 1911 up for 45 Super (which was not expensive and the turn around time was only 5 or 6 weeks), other than that I run an 18 1/2 pound spring and run my target loads (200 H&G around 850 fps) up to my 45 Supers (230 XTP's around 1,100) with no change. 45 Supers are put up only in Super brass!
While I like the 1911 in 45 super... I really like my S&W 625 which I run 45 acp, 45 acp +P, 45 Super and 45 Auto Rim (mainly for cast bullets that will not feed in the 1911).
from Starline's website; "45 Super* is the same externally as the 45 Auto, but has a thicker web, denser grain structure in the metal, and special heat treat process that enhances the durability of the case. Similar internal capacity as the 45 Auto."
https://www.starlinebrass.com/brass-cases/45-Super-Brass/460 Rowland; The 460 rowland case is 0.954-0.960 long vs. the 45 acp which is 0.892 - 0.897
https://www.starlinebrass.com/brass-cases/460-Rowland-Brass/Jerry
