Hi Guys, I'm trying to get my 29" 1:8 twist 7 SAUM to shoot Berger's 184gr F Open. I use Norma cases that I neck turn and have access to H4831sc, N560, N565, N570 and Retumbo with either CCI 250 or BR2 primers. My freebore is 0,230". 58,6gr H4831sc gives me 2900 fps and I tried seating depth from 0,020" to 0,005" with mediocre results. Retumbo looked promising at 63.2gr for 2940 fps but pierced primers when the temp went up 50F but gave me 2/3 hits at a mile. I really need some help with this one. Any thoughts?