My best results (so far... ha, I can't wait to see what happens when I have more money...) have been out of a factory stock and barrel with the following done:
Barrel channel fully, generously floated until about 1" from the reciever, with a thin foam pad at the end of the channel.
Receiver checked for levelness, aftermarket weaver base (loctite on all screws except action screws), weaver quadlocks, BSA 6-24X 40mm AO (I think that parallax could be hurting you BIGTIME... look into a good AO scope... it'll allow you to focus the target and crosshairs together).
Bolt full polished, SLIGHT radius, bolt face smoothed out, guide rod polished, bolt buffer made from a 3" x 1/4" nylon bolt.
Trigger has an overtravel stop made from JB weld (CAREFULLY measured), Power Custom hammer polished, everything polished up, WITH trigger return spring (clipped 1 coil, polished plunger and inverted assembly so spring rests on trigger) = 1lb 14oz pull, WITHOUT (set trigger... I like it. The perfect safety! I can carry it around, and the rifle's totally deactivated) = 14oz pull.
Your mileage may very, but with a MINIMUM of financial input, and a lot of DIY guidance from RFC, I've received pretty good, not "superstock", but pretty good results with okay ammo. About .75" @25 w/ Fed 510, about .3-.4" with CCI Standard Velocity, and .2-.3" with PMC Target 22 (no longer made, bummer).
Here's 10 with... hmmm, it was either 510 or Remington Golden Bullets: