I new to the forum. I was wondering what you alls opinion was on what would be the best cartridge to get for 90% of the time shooting long range target and 10% of the time elk hunting. Initially I was debating on 4 options, 7 prc, 7 rem mag, 300 win mag, and 300 prc. I decided against the prc's due to short barrel life. Here lately I been pretty confident about going 300 win mag, especially with future reloading. Is there something better I'm missing or is this a solid decision.
7PRC really is the easy button here. Barrel life difference from all of those cartridges will be negligible. The 7 Rem actually has greater case capacity and actually pushes lighter bullets faster than the 7PRC pushes heavier bullets slower. Some have recommended 280 AI and that's a great cartridge, but it's shooting the same diameter bullet with generally lighter, lower BC. Both the 280 AI and the 7Rem will typically come with 1:9-1:10 twist barrels in factory rifles, and generally aren't designed to shoot the heavy, high BC 7mm bullets on the market today. I haven't run a stability calculator to see where the break point is though, to be fair. Of course you can have a custom 7RM built with a 1:8 twist barrel and a custom throat and it will outrun a 7PRC, but that will cut down your barrel life. I have a 300 PRC, killed two bulls and some deer with it, love it, but there's nothing the 7 PRC with high BC projectiles won't do that the 300 PRC can IMO, and you're dealing with a little more recoil as well.
My 300 PRC 22" barrel shoots 212 ELD-X (.663 BC) at 2820 fps.
I'm putting together a 7PRC right now and expect to shoot the factory 180 ELD-M (.796 BC) at about the same speed, which will equate to less drop at distance, and will be just as lethal on game out to as far as I want to shoot.
My opinion is worth what you paid for it, but I say eliminate barrel life from the equation among those cartridges, and pick the one that best fits your circumstances (factory vs custom, reload vs factory ammo, ratio of hunting vs target, recoil considerations vs weight of rifle for both target and hunting scenarios, etc). I'd pick the 7PRC. Best of luck!