So tell me, with the 69gn SMK's am I best suited with AR2208 instead of the 2206 that I have been using in my 55gn reloads?
2206 prob the go with the 69 gr. 2208 a bit slow, but you can prob use either. The 2208 works really well in the 223R with the 80gr proj and 30 inch barrel. Using a leade suited for the longer projectile, you can fit 25 gr of 2208 and have it fill the case. We use CCI 450 primers.
But, as usual, you should test all your loads at lower settings first, in your rifle.