I have a 7.5 inch Magnum Research Revolver and a Bighorn Armory Model 98 carbine both chambered in .500 S&W magnum. The differances in FPS were averages between the pistol and rifle. Also, I just listed the MFG requirements on primers. I used LRP in all loads and powders even where the MFG said to use LRPM. Then I switched to LRPM in all loads in all powders. It did make a considerable differance in FPS. Rather than a large spread sheet with differances I averaged the FPS across the board. Also the the twist rate of the rifle is 1-24 and the pistol is 1-10. I also averaged the differances in FPS between the two. The recoil is managable even with 375 grain HCFNGC rounds. I did shoot a 500 grain buffalo bore round that will wake you up. The special rounds are about the same as a 44 mag in recoil. I can only use longshot and tigegroup in the specials. The other powders at minimum load over fill the cartridges.