A gunsmith would make sure extraction and ejection work all the time , firing pin lock time is right, trigger tuned, bolt is properly trued up to action, scope/sights set and won't move under recoil , magazine holds in ,you don't want it opening up under recoil. other things are what you want done stock length etc. A .375H&H will drop a Elephant BUT if your shot is off or charge happens you want something bigger a .416 Rigby is good but a double in .470NE is much better! A Dakota or custom shop Winchester is a rifle with everything and anything done for you but you pay a bit more.
RLI