Bipod and off a weathered wood bench which I'm guessing is not rock solid. I'm no bedding guy but a free-floated 452 .17HMR Varmint with a trigger like yours using a front rest and rear bag on a fairly steady bench could help tighten groups..a wind flag is always a worthwhile aid,IMHO.

Regards, Unk "Remember the men from whom you are sprung"