I have a 260 rem 1:8 twist 26" shilen barrel on its way for my savage rifle. I want to shoot 140's and it looks like everyone is using H4350 around the 42gr mark and getting 2800fps. I have looked all over in my books and with 42 grs it shows only about 2690fps, does 2 inches of barrel really make up that much velocity? Also i havent seen H4350 around here for 3 years so its out of the question. should i use h4831sc ,imr4350, imr 4451 or reloder 17? I can get any of those. The imr 4451 looks promising but has much lower mv compaired to H4350. I want to shoot to 800 on steel and hunt with this rifle so a fairly high mv would be nice. I have to drive 2hrs to get powder and bullets so it makes it a bit harder