z1r, Both the 416 Rem. Mag. and the new 416 Ruger are being held back by the factories, at least in 24 inch length barrels, to 2400 fps, as this is what the bullets were designed for. I have a couple of grains more volume than the 416 Taylor. There are now two different nose profiles, one made for the old Rigby, and the newer, shorter one, made for the 416 Remmie and Rugers. I checked with Woodleigh, and I can use the longer Rigby nose profile, even with their 450 gr. solids, in my 3.51 inch magazine. I may have to roll in a new cannelure to space out the 400 gr. Rigby profiled bullets another tenth of an inch to get up to 2400 fps, but that's doable. Right now, I'm within a few grains of the 400 H&H., which also gets 2400 fps. with 400 grain .411 bullets. Reloader 15 is 'THE' canister powder to use here.
