I have a 17" MGM .22WRM (they mark them ".22 Magnum") custom barrel on my G2.
With the WW 40 gr. HPs it will shoot just around 1" three shot groups all day (I don't shoot 5 shot groups in a single shot rifle used for hunting). The Remington Premium "green tip" 30 grs. do a little better but not enough to be worth the cost. I use a Nikon 4X fixed power scope; carry the rifle in my backpack.
Since in the area I hunt we are now required to use non-lead bullets for even non-game species, I have to re-sight it in with the WW 28 gr tin core/copper jacket bullets. Don't know what that will do to accuracy; have heard it is not good with some rifles.