The .50 receiver for the hunting rifle is mostly useless because .50 rounds are extremely rare, and it doesn't even do any more damage than .308. 
In real life a .50 round has like 6x more energy than a .308 round, I don't know what Bathesda is thinking .

This mod doesn't increase damage by 6x, only to 188 for maxed out rifle man perks. I think this is a relatively balanced place to be at. Please leave comments on the balance issue.

speed of reloading and cycling have been reduced, as well as increased weight.