RE: Loading for a semiauto?
I agree with the folks above. I shoot only reloads with my BAR .270. Shoots nice.
I suggest you use a slow burning powder. I use IMR 4831 with good results. I am also a bit more careful with my brass. I full length resize every time use RCBS small base dies. I don't know ho much difference this makes but I bought the dies on the advice of someone who knows more than I do and I have no reason to regret my descision.
Have fun and be safe ...