Well back to basics when something just ain't right.

Is that scope base nice and tight?

Is the scope questionable?

And that new barrel needs to be cleaned alot, REAL good and REAL frequently. That new barrel has got some sharp rifling.

Our H&R 20 can pretty much drive tacks. We shoot the Brenneke 3". For awhile we were shooting Remington Copper Solids with very good results because I got ALOT of them dirt cheap. But we do the Brenneke now and I shoot nothing but Brenneke 3" Gold Mags from my H&R 12.

Yep, I clean my barrels alot but for what the guns deliver it's more than worth it.

By the way what was the turn around time & cost on that accessory program conversion. I just happen to be setting to doing it myself.