Remington 700 Sendero II, Savage 12VLPS, Howa 1500 Lightning are all good 7mm Magnums. They have heavy barrels.
.22-250, .243 Win, 6mm Rem, .300 Win. Mag, and .338 Lapua Mag are also long range accurate chambers.
My dad has the model 70 chambered in .375H&H magnum. Excellent rifle. Winchester only makes .22 LR's and Super-X shotguns and semi-autos.