I was in the same boat. I bought and sold several 300 win. Just couldn't get the heavier bullets to fly the way I wanted. Had a friend get a 30 nosler and had the same issue. Then then the 300 prc came along and a lightbulb flipped for me. I got brass from ADG and haven't regretted it one bit. It is a sweet shooter and handles the heavies at faster velocities than expected. Also, just got an email last week that they are doing another run of 300prc.
However, had I known more about the Sherman cartridges, I might have gone that route. To me it's between the Sherman and the PRC for the best of extended long range ballistics. But if you need factory ammo or if your not shooting at extreme ranges the 300 win is plenty of gun for anything on this continent.