And you seem clueless on the physics of it all. Speed (velocity) is a 4 times multiplier for ft lb of energy. Bullet Weight is a 1 for 1. Do your homework , recoil calculators put the 416 WB at approx. 70lb of recoil, given that number, if a good break will reduce that 40 % you are now down in the 38 to 40 lb range and at the same time still have 6400 lb of energy at the muzzle --- compare that to your 375
Here are comparisons to other dangerous game cartridges,
Yes, in a 11.5 rifle, a full load in a 416 Weatherby produces 72.1 ft. lbs of recoil. This is nearly equal to the recoil produced by a 458 Lott shooting a 500 gr bullet. That amount of recoil gets one's attention but in not intollerable if one practices.
Note: At 2550 fps muzzle velocity, the 416 Wby produces only 5776 ft. lbs, of energy. The 450 Ribgy produces 6400 and the 505 Gibbs produces 6716.
I shoot my 450 Rigby with 92 ft. lbs of recoil without a muzzle break. It rocks me backward but is tolearable for a magazine full of cartridges. My recovery time between shots is however more than me shooting a 458 Win or Lott.
Frankly, I don't know if I will ever hunt Africa with my 450 Rigby. I can thread a needle with my .375 H&H, shoot cloverleaf groups at 100 yds with my 416 Rem, and enjoy shooting with the satisfying "push" of recoil against my shoulder with my .458 Win. I've owned Lotts before and will again but the mighty 458 Win seems to be plenty for up close and personal dangerous game hunting as a client hunter. For a PH, a Lott or 505 Gibbs make a lot of sense!
As for killing power, Taylor's Knock Out blow formula rates the 416 Wby at 60, with the slower 416 Rem and Rigby at 57 each. That 5% increase is hardly worth the increased recoil! The KO factor isn't science but a fair estimate to compare killign effectiveness from John Taylor, someone who truely had been there, and done that!
I shot my
@Altitude sickness .505 Gibbs, twice. That was enough for me! It approximate 117 ft. lbs of recoil was over my limit! He however shot that rifle very well indeed! Recoil tolerance is subjective to each individual shooter. Gun fit is an important factor in reducing "felt" recoil.
Finally, considering your PH and more so, the native African trackers that will be with you when you shoot your buffalo, it is my opinion that if one needs a muzzle break, they are shooting too much gun!