New one for me. The oldest Son picked up a .300 Weatherby chambered controlled feed M70 stainless classic. THEN he checked prices of ammunition and components....got to looking around and I have on hand about 200 rounds of .300 H&H in WW brass unfired. I realize that the H&H is the parent for the Weatherby, but it's just ever so much slightly longer in finished form. Do I need to trim the H&H back to the Weatherby length before fireforming, or go ahead and form it, then trim...?