Back in the day, I reformed brass from 6 Rem RP. Hint. For pure speed shoot a 6. But a 6.5 loaded well retains....with good bullets.
I like Lapua brass if bolt face and extractor correlate. My former SS Fwt ran WW - and maybe not by choice. Cannot recall.
Pick optimum powder for bullet weight. Then find your pressure with a kiss or as close to it. 70s have long throats so you may get a freebore but can still shoot DOA - deer of angle. Deer won't like you
