Actually,the rum has advantage over stw same as stw has over 7mm rem. With pressures being equal,the rum gets the nod on velocity but you are going to burn EVEN MORE powder. The rem 7mm,300 win,338 win,8mm rem,7mm stw all have case head size of .532 while rum is .537 but the rum is full width whereas the stw is standard thickness of 300 winwith belt. They are correct that you need longer barrel with stw or rum with bare mininum of 26" with 28"-30" being preferable. The question you should ask yourself is how often you'll really need the extra speed vs longer,heavier,unhandy for most hunting unless you want a specialized beanfield rifle. As it is,the 7mm rem is versatle enough most hunting situations without the ungainly long barrel.