you carry side arm and rifle? Dont know anybody including guides in my area that pack the extra weight.I front carry for a reason because of where I hunt.It major grizz area next to Glacier and I hunt both borders N &S have a friend that was mauled.I know this is a long range forum but alot are practicle hunters first,before just LR.Our timber and hunts differ greatly from the east side where your at.Any more the only rifle I'd build with a mag is if I was using a control feed action other wise solid bottom action built for single feeding would be my preference. I've numerous times put multiple rounds through bull elk near and far single sledding, if I've had issues with close fast shooting it's always been mag feeding related, single sledding has been a much simpler bet. I put three rounds through a bull at 600 yards feeding them of the stock pack so fast and easy a mag feed would not have been any advantage. Shot many at close range never once wish I was mag feeding, a few years ago I had a round jamb in the mag and screw the whole works up, hunted the rest of the season with that round jammed and found I never missed it.
I also hunt in areas with grizzlies and never ran into one where if they decided they didn't like me I would have been lucky to even get one round of, my rifle would actually be a liability at that point with optics and long barrel, my side arm is much more suited to bear defense since I have more rounds to bring and I practice using it in self defense situations.