These are near maximum loads, you should use 10% less to start. ) (see note on powders below or read all about various powders. ) bullet sizes vary. Accurate 5744 and hodgdon varget performed well with winchester large rifle primers and federal. I tried 4198 (h4198 only), h4895 and re15, none of them were as good as 748. I always wanted to try re12 but never got the chance before it was dropped from. Imr 8208 xbr (improved military rifle) primer: Webhowever, to truly unlock the potential of this caliber, it is crucial to understand the intricacies of powder reloading. In this article, we will explore the basics of powder reloading for. I load home cast 385 gr gc bullets to 1800 fps.