Some years back John Barsness had a good article on scope durability in Rifle Magazine. He spoke highly of the Bushnell 3200 & 4200 as well at Weaver Grand Slams, Burris Fullfields, Nikon Monarchs as well as Leupolds, Swaravski and other "high end" models.
But he also cautioned about putting heavy scopes on hard-recoiling rifles. 5-15X50 is a heavy scope; and, depending on the weight, a .300 Rem Ultra Mag can be a hard recoiling rifle. Although it's not in the same league as .338 and larger.
I'd be inclined to put a smaller scope on a .30 caliber magnum, especially if the intent is hogs and big game. But your choice will probably hold up OK. If not, Bushnell has pretty good customer service on their newer scopes.
I don't own any 3200 scopes, but I have a Legend which is sharper and clearer than my Bushnell Banners. I would expect the 3200 to be sharper still.