Hi Mike. Nice shooting

and welcome back to the hobby that keeps us ALL coming back .. after 15 years or 15 days!
A polite and friendly word of advice that might help you a little - though you are doing really well anyway!
Your group is only varying left and right....your up /down grouping is super tight!! you might want to look at why?
Is your head moving left and right a little bit and therefore maybe your Scope parallax adjustment is set wrong? If parallax is set to the wrong distance, then moving your head around will make the cross hairs move. OK it would also do it up and down to if you moved your head up and down.... but when your cheek is on the stock i bet it wiggles more left and right than up and down. Mine does as my cheek flexes
Or maybe the way you've rested your gun is rotating left and right a little when you pull the trigger. This is also something I suffer from especially when resting on a bag.
I hope these little idea help a bit and I hope they're not taken as negative, because they're only to help.
Best regards
BoR