My Winchester Model 70 does not have a detachable magazine, but has been a great elk rifle for me. It does have a muzzle brake, which makes it a little softer shooting. Without the brake I have to admit to developing a flinch, and the brake makes it comfortable. I like the .300 mag for elk, of the 3 elk I have been fortunate to harvest, they all went down quickly with this cartridge and well placed shots. This rifle is also very accurate, and will shoot MOA with good ammo if I do my part.
I have also shot the Browning rifles in other calibers, the ones with the detachable magazines, and found them to be accurate nice shooting rifles, so that would be a good choice if you want the detachable mag.
Would definitely recommend stainless if most of your hunting will be west of the Cascades. Probably less important on the dry side of the mountains.
Have found that shooting sticks give me good versatility in field situations, and prefer them to a mounted bipod. I like some kind of a rest if I have time, even leaning against a tree, or on top of a convenient stump, but if neither of those is present, the shooting sticks work well. I can shoot off hand too, and do, but the excitement and adrenalin of the moment make me less steady, so that works best for close range. A range finder also helps, they are large animals, and I have been fooled into thinking they were closer than they really were and missed because of that.