16" .308's are an acquired taste. Wear ear plugs under your headset
Think I'd stick to 4895 or very similar powders in the M1A. In a .308 AR I like Varget, but others will work well. The AR has no silly operating rod to bend
These are real useful for checking fired cases, and making sure you don't over-size them:
http://www.midwayusa.com/product/47...pace-gauge-5-bushing-set-with-comparatorAnd they don't cost a lot.
Last, let us know how the Daniel shoots. I am curious if they are worth the money.