My .40 has a Green Mountain swamped barrel. I shoot .390" ball because that's the only mold I own. Maybe later I'll get a .395" mold.
60 grains does very well, for my shooting ability, at 100 yards. It might become my deer load should I have the opportunity to hunt with it. After testing with it I will probably drop down to 55 grains as it gives a lower ES and SD. With either .020" (compressed) mattress ticking or .025" compressed denim, both lubed with TOTW mink oil, it gives well over 2100 fps and 60 grains of 3F.
With 40 grains of 3F it gets about 1700 fps and is very accurate. This load with 40 grains or with 30 grains is my everyday load. Rather tight load but seats readily with the wood rod. Fouling also doesn't build up and I can shoot several dozen rounds and not have to wipe.