Comparing a 400gr 416 with a 400gr 458 is like comparing apples to oranges. The sectional density between the two is way diff. The lighter 458 bullets are 45/70 bullets that are great for non-dangerous game except for some boar and black bears. The 450gr bullets are the answer to the 458 WinMag's smaller capacity case. With today's powders
and bullets available, 2250 f/s with a 450gr wouldn't be out of line, it'll be awful close to that. BTW, the other 450gr bullets made are NorthForks and are offered in softpoints and solids.