Yondering- I've tried to develop the most accurate loads with both powders. The most accurate H4895 loads shoot a little faster than the most accurate TAC loads. I've primarily used two Sierra bullets simply because they shoot so well: the 65 GK and the regular (untipped) 69 MK. I stay just below max. with both powders. I have the Western book and I'm aware of the 5.56 loads. I just don't have a need for such, at least for now.