I have an "early" .22Mag/20ga with "solid" barrels and a later .22LR/.410 with separated barrels. Both rifle barrels are one hole groupers @ 25 yards with ammo they like and both shotgun barrels hit to point of aim. The Warne steel rimfire rings are the only rings I've found that have enough bite to hold tight on that shallow groove and I've had no movement, even with 3" 20ga loads.
