These are the SAAMI specifications from ANSI Z299,4 for 416 centerfire rifles:
416 Remington Magnum 350 2,525 650 666 691 400 2,400
416 Rigby 400 2,370 520 533 553
416 Ruger 400 2,410 620 636 660
416 Taylor Magnum 400 2,370 650 666 691
416 Weatherby Magnum 400 2,655 Piezo Pressures Not Established
The headings for the data did not copy to this reply but are bullet weight, velocity, max average pressure, max probable lot mean and max probable sample mean. Note that the 416 Ruger pushes a 400 grain bullet 40 fps faster at 3,000 psi lower pressure than the 416 Taylor.Also note that at equal pressures (65K) the 416 Remington is 155 fps faster than the 416 Taylor but the bullet weights are not the same.

Last edited by bobmn; 11/13/18.