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I have 2 Marlin 444's, a Guide model and the standard 22 inch barrel model, both have 'ballard' rifling, and both shoot under 2 inches with handloads. The std 22 inch barrel model went from an average of 1.5-2 MOA to under 1.5 MOA after using Tubbs firelapping kit. The Guide gun shoots most handloads well under 1.5 MOA and some at 1 MOA and has done so from the 1st day at the range with no break in, firelapping or anything.
A Marlin 336 or 1895 should group at least 3 MOA with decent ammo. I agree with other posts that there is something wrong with your rifle that will not likely be resolved by firelapping the barrel.
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