Did grind but still have minor problem with bolt.... will try to give it a better cleaning see if that improves. I purchased some JB compound and Mothers Billet polish if this might help.

On a side note, yesterday was second day shooting it. Purchased 3 boxes of Hornady American Gunner 140gr as I'm planning on loading.... I still have a lot of practice to do... so my groupings need a lot of improving. I don't recall this from first time but yesterday did hear that pinging sound but something was shaking as I could see when looking through scope. I was using bags, possibly I'm not holding the rifle correct/sturdy enough or the bags?

Thanks.