I just purhased a 7mm RM Stainless Stalker w Boss, used. It is supposed to shoot bergers well, but the stated velocity seems about 75-100fps slow. I have the load info and boss setting. So my question is, would I expect that the Boss sweet spot could be radically different if I use the same bullet/seating but a different powder? I want to try Retumbo/H1000, but the current load is RL19. Expect velocity is 2860, and I hope for 2950. PS does anyone think that changing the bedding material from the factory "goo" mentioned negatively impacts the effectiveness of the BOSS? This new gun has an aftermarket stock(medalist).