I have some of these two powders left over from the 30-06 I had and was just wondering, if they could be used at all for .308 or are they just too slow burning? The rifle is a Rem. 700 sps Tac. AAC-SD in .308 with 1:10" twist barrel. I've been using Varget with Hornady 168gr. A-Max with good results but just thought I'd check. Thanks!