I don't know which is the most fun. My M1 Garand and M1 Carbine are both lots of fun. The Rossi 92 38/357 and Marlin 45-70 are both fun. My 22 Hornet is also fun... Right now though I'm probably shooting my CZ 452 17HMR the most. It's fun, super accurate, cheap to shoot, quiet, has no recoil and is a blast popping tiny little targets out at 200 yards with it... I just crank the elevation knob to the yardage and have at it...