I use 51 grns of IMR7828, and 58 grains of Magnum for the 140's, drop about 5 grains from this ,and you will be close. 54grns IMR7828, and 61grns Magnum for the 120's again drop about 5 grains , and you will be close. Mine are full power loads so start low, and workup to your ceiling..
Posts: 188 | Location: Las Cruces, NM | Registered: 31 March 2002
50grns of H4831SC under 140grn Sierra MKs gave me close to 3000fps out of my 28inch tube, with a standard barrel of 24 inches you should get 2700 easily. H4831 was also my most accurate load. I also tried 52grns of H1000, velocity was around 2800 and accuracy was not nearly as good.
Posts: 593 | Location: My computer. | Registered: 28 November 2001