ORIGINAL: oldelkhunter
BC I have used W748 43.5 with that same GMK bullet and it is very accurate..I thought Varget was clean burning powder.
I seem to spend forever cleaning out the powder residue when I shoot my 308. So I called the guys at Sierra, and one of them also agreed it can be dirty if its not high pressure. But goodness, I don't want go too much more than 45-46gr. I am hitting max at that.