Re: 7mm RUM vs .300 RUM
At 800 yards there is more noise from the bullet than there ever will be from the muzzle. Gun fire is a very faint sound at 800 yards. My opinion is that you scrap the suppressor idea.
2nd, on paper and in the real world, the 7 RUM and 300 RUM are impressive. They are also MURDER on barrels. It doesnt seem like a baboon merits a RUM even at the distances youre talking. Save some coin on reloading supplies and replacment barrels and look for a more user friendly caliber for the application.
Just my .02
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.