Siwash Report post Posted November 15, 2016 Helping a friend with a 26" barrel, 1:10 Rem 700 Sendero chambered in .300Win Mag make some test loads. In addition to IMR4831 and H4831SC, we have lots of Reloader 22. Anyone have the book data from Sierra for a .300WM and 180 grain SBKs with R22? I'm thinking of starting at 70grains and going up...but if someone can tell me what the lawyers at Sierra suggest it would be appreciated. Thanks, Share this post Link to post Share on other sites
lancetkenyon Report post Posted November 15, 2016 180 SGK? Which is a SPBT. Hodgdon book doesn't have a listkng for the 180 SGK, but it does for the 175 SMK, which uses the same jacket I believe. So it should put you in the ballpark. just start low. IMR4831 69.5-75.5C H4831 72.0-76.5 My old Alliant book shows max loads only for RL22 @ 76.9 My Lyman book shows: H4831 70.0-77.0 RL22 70.5-77.0 Share this post Link to post Share on other sites
Siwash Report post Posted November 16, 2016 Thanks...yes I think it is a spitzer boat tail soft point, do not have the bullets from him yet...he just said "SBK." Appreciate the info... Share this post Link to post Share on other sites
