My M70 pf 24" 300 Win Mag shoots a max loaded 180 NPT with good accuracy using RL-22 just fine at 3110fps seated to 3.34" (because of the mag block in the action), yet my M700ss has a 3.6" box but a tighter chamber and will not even begin to tolerate the same load. Ended up using IMR 4350 and 180 gr NPT's with it avg 2995 fps . Can't see a difference on how dead the animals are with either load. I mean you know they were just as dead as you can get them. Everything shot with my 308 Norma gets dead too. Damn it all for there not being a provision in determining the degree of deadness. Oh besides that you can buy 300 Win Mag ammo just about anywhere ammo is sold. Magnum Man