I have all three barrels as well. For the reloader the 7X30 is the ticket. For those that do not reload it is a toss up when you consider the Hornady Leverevolution for both the 30-30 and 35. This using a soft pointed tip slug for use in a tube magazine. These should work great in the Contender. The hornady web site lists velocity at 200 yards of 1916 FPS and 1304 ft-lbs energy. Not bad for the "OLD" 30-30 round using off the shelf ammo.