I have not heard that about the 300 RUM however the 7MM RUM is a different story. Even so, if I wanted one, I wouldn't let that stop me. Buy it and get step up to reload right away. Most here who have them would probably agree that you really have to reload for that rifle to bring out its best. If you don't plan to reload then go with the 300 Win Mag or the 300 WSM. Ammo will be cheaper, easier to find and all three with factory loads will perform pretty much the same task.