I'm putting this here not because I want you to try this load. But because when I researched it I found very little data on it, and what I did find just didn't make sense to me.

250gr. Missouri hardcast "pin busters". Round nose flat point bullets with a Brinell number of 18.
6.7gr of AA#5 = 925FPS. Seriously . . . .
Large primer once fired nickel plated brass cases (Speer)
COAL was set at the top of the made in crimp groove on the projectiles.

I put an 18.5 pound recoil spring in the gun, deeming it absolutely necessary around 5.0gr of AA#5 based on slide velocity and spent cases winding up somewhere probably in Southern Alabama.

- - Backstory - -

Removed on the advice of someone far smarter than me.