7mm416 Can get 3675 with 162 gr. Hor BTHP shoots best at 3500 With the 338-378 3100 with 300gr A few of my friends are getting 3200 with the 338-416 Bruce also has the 338-408 big Baer He runs the 300 gr. close to 3300 for his best groups I would not build a rifle with a case this size on anything but a custom action I have a Bat on the 338-378 and Lawton on the 7mm 416 I have seen people use factory actions ,but I would not. Also you run into trouble with case lenth. The 300gr. is great when you get it moving. Just might turn the 7mm 416 into a big Baer when the barrel goes south But it is a (BLAST) to shoot
there is a man in drifwood pa that hunts with a 338 on the 416 case out west.the gun weights 60 some lbs.and has a barrel that is I think 36 in long.he shoots 300 grain serrias at about 3100 fps.and has killed elk out to 2000 yards.i think he posts on this sight.pm me and I will see if he allows me to give you his email address.