For shooting to the 6 I'd buy 600 BTHP's and not look back.
I love the A-Max and it is a more better bullet in the wind, but I stock up on the BTHP's these days because for me they've proven more forgiving in a variety of 7, 8, and 9 twist guns.
Particularly short magazine stuff like AR's, the Howa Mini, and Ruger Americans.
Travis