I must disagree. These are three round I know practically nothing about besides ballistics. I take all comments into consideration. From the comments I now know: The UM is a master's rifle, i'm not a master. The. 300 SAUM is effective but unavailable. And the .300 Win. Mag. is balanced, as in decent recoil and good accuracy. I could honestly say that from the comments I've learned that knockdown is not as important as accuracy, but still needs to be relevant(Although the reason is significantly more than that). I've also learned from what i've read that 7mm SMs and .270 SMs give me a unique gun with great results. Honestly if i were you i'de be more worried about me trying to get away from the crowd and changing my opinions from other people's opinions and facts too easily. At my age(now days) when you ask about one caliber, another one I've never heard of will come up. But in all rwality, you shoot a deer in the heart with a .223 it dies, same thing with a. 50, that to me proves accuracy is more important than knockdown no matter what. That shows me that if you put that gun in your shoulder alittle more, that could effect your shot, same with flinch. So I guess i'm saying, if I'm elk hunting with a. 270, and my friend has a .375 I could care less.