"Ruger only" type loads generally top out at around 25-28,000 CUPs, considerably less than the 44 Mag. These include loads such as the one I shoot in all my Colts...BH, RH, and M94 Winchester, which is 23.0 grain of W296. It pushes a 300 grain jacketed, or 320 cast (RCBS "300", nominal weight)...