I have a Ruger Precision Rifle in .338 LM and it loves US 869. I've experimented with that and 50 BGM, both which work very well using 300 gr Bergers. H1000 also good. Have a Fierce .338 LM that shoots 3/4" (sometimes better) using H1000, US 869, not as good using 50 BMG. Have used 236 gr...