Just seeing every ones thoughts are on what they think is a great all around caliber for North American big game.
I really like the 280s/7mm but the 6.5 284 has me interested
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Are you looking to turn friends against each other!?!? You don't just walk into a group of rifle enthusiast hunters and ask something like this! Nah just kidding, of course this is a conversation that's been had 1000 times but it's a fun one and evidently lots of folks are up for having it again as these kind of questions always garner a lot of feedback.
the 6.5-284 is energetically on par with the 270 win, perhaps a tad weaker BUT not for any distance, it can be regarded as an equal to a 270 at normal range that does better at longer range. I say this because the 270 is often listed as the minimum recommended horsepower for elk and moose by many guides (though no legislature). While the 6.5 is 13 thousandths of an inch skinnier there's no real world difference at all. They shoot bullets of similar weight. The 270 is more ballistically impaired regarding bc, and I hate to admit that! I have a .270, the first rifle I ever owned, given to me when I was 13 after I got my first deer and demonstrated I could put such a gift to good use. It'll do it all, and has light enough recoil for most anyone to learn to shoot excellently with it. I'm glad I didn't start with anything bigger. (What I started with was dads 30-30, then an uncles .303 British, then the neighbours 30-06, then the 270 - they didn't have any savage 30-06s in stock so I got the 270 - so happy in hindsight, I much prefer the 270).
However if asked to recommend a single all purpose North American cartridge I feel the 270/6.5s and even the 7mms to be on the light end for the big stuff. Once again the wisdom of the guides is worth heeding. There are guides who list the .300 win mag as minimum for big bears and for bison if those will ever be on the table. I read recently an article asking a much of moose and elk guides what they'd bring on their own hunt and overwhelmingly the most popular response is a .30 caliber magnum of some kind, the win mag obviously being the most common among such cartridges. That's my vote.
i recommend the .300 win mag as unbeatable as a sensible choice for all purpose hunting in all of North America. I put my money where my mouth is too...my two main go to hunting rifles are a 270 and a .300 win mag.