Going up just 1# from factory isn't much of a difference considering 45 Super's have up to 36% more pressure than a standard 45ACP.
In my 4586 I use a 22# ISMI flat spring (GLC-22), on a factory guide rod turned-down to .255", along with a standard mainspring along and extra power magazine & firing pins springs. (This setup is similar to my 1076's but with a heavier mainspring)
Most 1911 projects up the recoil spring to around 28#-32#. I went with a heavier mainspring & a slight lower recoil, in addition to a small radius firing pin stop, in my Government Series 70.
I only load 185gr JHPs (shallower seating depth than the 200gr.) in S-L 45 Super brass in mine. Using Power Pistol and the reloading data from "Project 45 Super", 185gr. JHPs are documented as hitting 1403 fps from a 5" 1911. (Buffalo Bore lists 1330 fps for theirs.)
The same handloads work fine in 325/625 revolvers using S-L 45 Super or S-L 45AR brass.
To a hammer everythings a nail
Last edited by BLUEDOT37; 03-25-2017 at 02:10 AM.
Reason: . 1076 has heavier mainspring