Hey guys, I bought some IMR 4895 thinking it was H4895, did some research and it seems like it will be acceptable for the 223 but is there a good rule of thumb for a load? Should I load a certain percent less or more with IMR4895 when using H4895 data? None of my books have IMR4895 listed, only H4895. I'll be using a 55 grain Sierra Gameking Spitzer Boattail, can get 63 grain Sierra Varminter bullets if those would produce better results. Thanks.
IMR-4895 and H-4895 are not the same, but very, very close.
Either will work fine with the 55 SGK or the 63gr bullet.
Max for the 55gr bullet is ~26gr of either powder, and max for the 63gr bullet is ~25.5 for either powder.
As usual, drop 10% and work up... and look for the usual suspects.