Re: 416 ULTRA MAG
Fiftydriver summed it up very well.
As you know the 416 rigby was introduced in 1911 and is still a great cartridge after almost 100 years.
But it was designed for pressures of 40,000 cup.
The 375 UM is designed for 55,000 cup, Brass is thicker
from case head to shoulder because of higher pressures.
All factory loaded 416 Rigby is loaded at 40,000 or less
because of all the fine old Rigby,s still out there doing
The idea is to build a more powerfull 416 on modern brass
that will work in a long action REMINGTON without any bolt
Reloaders can up the presures on the RIGBY in modern rifle,s but at a cost.
The problem of items that go through customs is allways
time . ship early and talk to the P H about a contingency
plan if this does happen.
I have a 416 Rem and love it but some people want more velocity and energy for very large and dangerous game
but cant handle a 460 or 500,s recoil.
This round should add 250 to 300 fps and go from 5600 ft/lbs
to 6400 ft/lbs (the 458 win mag is less than 4800ft/lbs)That
would add over 1500ft/lbs than a 458 Win Mag and a much flatter Trajectory.
So this should be quite a rifel, easy to build and very powerful.
Thanks for all the comments
J E CUSTOM