The .356 caliber can be found in the Winchester lever action and the Marlin lever action most commonly. However the conversion from a .35 Rem to .356 bigbore is not that difficult. The caliber has been around for quite some time.

The .350 Rem I thought only came in the old Remingtion model 600M. Mostly used in Africa or so I thought. It is another bigbore caliber.