The decision I need to make everyday on which one to carry. Wilson Supergrade Tactical, Wilson Supergrade Compact, Wilson EDC-9, Wilson TLE was my work gun, and the Nighthawk Bob Marvel in 10mm, Also have the Cabot Guns Gentleman carry.
I have an Adamson Upper on a Areo Precision Lower. It has a carbon fiber barrel. I also have about 3600 rounds for the rifle. The rifle never been fired.
I fired over 500 rounds through my rifle without any issues. I only shoot factory Federal or Winchester 168 BTHP. I did try some of the Hornady 155 gr TAP bullets which also had no problem. I think it's the ammo.
Just my 2 cents worth.
It would depend on how much you plan on shooting it. If money is no object then go for the 416, much more accurate. If you want to experiment with different rounds, then go with the 50 CAL.. Just my two cents worth.