These 416 bullets have a split personality. There is a Rigby nose profile, and a Remington nose profile. The Rigby bullet sticks out farther from the case mouth. The Remington goes deeper into the case. Both of these being crimped into their respective cannelures. The Speer 350 gr. Mag Tip has a Remington nose profile. Obviously, putting a Rigby nosed bullet in will give you some added capacity.
If I seat a Rigby bullet all the way out to the 3.51" limit in my M-98's extended magazine, I can equal the 416 Ruger's net capacity in a standard magazine. My 416 is a wildcat, made from 375 Ruger Brass, and is the same length as their 2.6 inch long 375's. All my case taper's lost capacity, evaporates when I move a 416 bullet forwards from 3.34 to 3.51 inches, C.O.A.L. The 416 Taylor will mirror this, but with just a bit more, as its a couple of grains less capacity, than my wildcat.
If you are merely gleaning data from printed pages, this dichotomy in the 416 bullets, needs to be addressed. Rigby bullets in a Taylor with a slightly extended magazine, kicks things up a notch or two. Also, the maximum designed penetration for those Speer 350 gr. Mag. Tips comes with only 2400 fps.
FWIW, my 416 uses a L. Walther 1 in 14 twist barrel. In the early Taylors, there were some 1 in 10 twist bbl's, which could be deathly accurate, with 400 gr. bullets at lower speeds than either the Rigbys or the Remingtons.
Woodleigh e-mailed me that my magazine length, plus my 1 in 14 bbl. will handle their 450 gr. S.P. or Solid bullet with the Rigby profile. I picked up a N.O.S. bag of 410 solids, and these kick the pressures up so that I'm only able to do abut 2150-2200 fps., before I start getting cases setting back. I built my wildcat rifle to duplicate as closely as possible, Harry Selby's infamous military Mauser, 416 Rigby.
With my shorter 2.6 inch long wildcatted 375 Ruger cases, I didn't weaken my receiver's bottom bolt lug abutment. In my R.Famage Colombian military 30-06 action, my cartridges drop cleanly in between the clip slot and the factory notch in the front receiver ring. My G.S. wouldn't notch the side of my receiver, in the right rail recess, like Selby's, as he thought this might weaken it. My rifle's weight and balance are right on point with Mr. Selby's, as taken from an article by Layne Simpson, who handled and shot it, some years ago, at Wingmead Plantation, in LA.
