I have seen a few “is relevant “ threads I don’t get the question if you want to shoot it then it’s relevant. I thought about the 300prc but I have wanted a wing mag for so long. Just wasn’t sure if there was any major down sides to reloading.
The biggest downside will be the eventual constant barrage of forum posts asking "Is the .300 Win Mag still relevant?" Yes, Virginia it is. It was relevant in 1963 and it will be still be relevant in 2063. Oh, and before you ask, the .30-06 is also still relevant.