For action pistol I need to target 980FPS with my 127gr lead plain base hollow point (power factor). The bullet is essentially the MP 360640L at .358. Right now I'm up to 4.6 gr of W231 and averaging about 860 FPS (2 different chronos).
Looks like I may need to bump up to 4.8 grains of W231....is that getting a bit extreme?
Using a K frame S&W with Clark 6" barrel.