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B: I've used the 300's up in Canada myself with 165's,shot several bucks with them, and they work really well,if you can shoot them.But you and I both know that lots of milder stuff works equally well,and they really are not "needed".

Yes, lots of stuff works and works well. But the 300 rum/165 AB combo I mentioned drops them more immediately IME with non CNS hits. Is this an advantage? IN some circumstances, yes. But not enough to make the difference between filling your tag or not.
And your also right, alot of guys cant shoot magnums. Taking a trip to the local range in my neighborhood also confirms that guys cant shoot 30-30's and -06's.. Really, shooting a magnum is mostly a mental game and with some practice they can be mastered.