+1. When I did my work up with X-Treme 230 gr RN plated bullet and W231/HP-38 at 1.260" OAL (Sig/SA 1911 and RIA Tactical), 4.8 gr cycled the slides but blew back some unburnt powder. 5.0 gr was better and I settled at 5.2 gr.Walkalong said:Agreed, start at 5.0.