Having experimented with bedding and floating a variety of 22 makes I would not bother trying this on your model 60. Results were random with bedding for myself and gunsmith mate - sometimes improved, sometimes not. And with floating barrels we found some 22s actually shoot better with barrel pressure. Best thing to do is experiment with ammo types off the bench to see make what it cycles well and shoots most accurately. For the 60 microgroove barrel this is likely to be all things CCI - standard solids, subs and minimag HV. Occasionally Winchester powerpoint HV.
To sharpen your performance you can certainly try grub screw mod on trigger, or install a Mcarbo trigger kit, and experiment with different torque pressures on front bedding screw.
Marlin model 60s extremely accurate for basic semiauto. Of about a dozen marlin semis of different types I've had - models 60, 75, 795, 990, 7000 etc I found all very sharp off bench. All well under 1" groups (5 shots) at 50m, and almost all capable of sub 0.5". Best standard barrel sporter 22 I've tested off bench was a 1998 Marlin 60 which averaged 0.29" at 50m for four consecutive 5 shot groups, and second to that was another 60 averaging 0.39" That's exceptional - and well ahead of better 'name' rifles.
I wouldn't bother with the floating - save the Devcon for a centrefire.
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