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It's not only about killing power its about being able to reach out further with flatter tragectories and far higher retained energies.
The RUM makes it a lot easier for those that do not take the time to become proficient to hit there target at greater distances resulting in less wounded game or complete misses and for those that do take the time to learn to reach out to distances that you can only dream of with a H&H/Ruger.
Do you really believe this BS??
The RUM makes it easier for those that are not proficient to hit at great distance??? WOW!!! I guess you are the target audience for the "long range hunting" thread...

It's been awhile since I heard the BIG GUN NO PRACTICE theory...... "I don't practice much, so I got a MAGNUM because it will just knock them down at any range"
Reach out to distances that you can only dream of with the H&H or Ruger? You should probably crunch some numbers on a ballistics table
Using the same bullet and same 200 yard zero, and Hodgdons data (using top velocities for both loads) , I crunched some numbers in a ballistics calculator and came up with the difference in trajectory between the RUM and the Ruger stack up like this:
RUM
300 yard -8.03
350 yard - 14.06
400 yard -23.11
450 yard -33.75
500 yard -46.76
Ruger
300 yard -8.99
350 yard -16.36
400 yard -25.9
450 yard -37.85
500 yard -52.47
Out to 350 or so yards, the trajectory is so close as to be meaningless in the field, and past that you are going to need some sort of compensation other than just "holdover" to assure a clean kill, so you are going to use turrets or a ballistic-plex scope, and once you are using these tools, a slight difference in trajectory (LESS than 6" at 500 yards BTW) is irrelevant.
The difference in energy out at 400-500 yards is about 200ft lbs .....Less than the energy generated by a .22 magnum rimfire
You may think that this slight increase in trajectory and energy numbers is important, but I assure you that to a marksman that is competent enough to cleanly kill at these ranges, these numbers are only data- They won't in any way increase or decrease his chance of killing the moose...And the oose doesn't care either!