Hello guys. I want to have a custum rifle built for large game hunting, so I am looking at calibers like a 416 Rigby, 375 etc. It will mainly be for bush hunting. I am new at this, so could someone give me pointers at what I should look at when starting up. I live in S.A so it would be difficult to use one of the gun smiths that is on the site. All info is appreciated.