RE: 30/30 marlin rifle
It depends on what it likes. I shoot fusion 150grn through mine, as it groups around 1.5" @ 100 yards. I tried the new Hornady Leverrevolution, but got a lot of drop when trying @ 200 yards. I would buy a couple different brands in 150, 160 and 170grns and try them out to see which works best. I would at least buy a box of the Hornady Leverevolution in 160grn and try them out, as they have potential to give you a 200 yard and little more rifle.