going to get started working up a long range load for a .270 sendero I just picked up. I have purchased 100 each 140 and 150 nosler BT's and 140 sierra 140 spbt. the powder I have on hand is 4831sc,4350,4064,h380,and h414. primers wincheter and federal. anyone have a favorite to get me started? which bullet does everyone prefer? primer and brass favorite? thanks for any help that I might recieve.