Trying the USMC 45 auto target load.
A Nosler 185 JHP over N310. They use just 4.1 grains with light springs IIRC, but my pistol (USP 45) is stock so I went with 4.3 and 4.6 grains to get the big beast to cycle.
I was shocked to see my local Fleet & Farm had the Nosler bullets, XTPs too. Same price as Midway, and sales tax instead of shipping, so it's a bit cheaper.