Accuracy issues: Equipment, technique or both?

[BjornF16]

Bob,
That is the most informative online coaching I've rec'd...thanks!

I realize that there is no single "golden bullet" to my mechanics. The scope setup appears to be a significant issue. This morning the scope was moving approx 10" across target (at 100 yds, so 10 MOA) when I physically moved it left/right. I have spent the last couple of hours setting up the scope and rings properly, including using levels. One level on top of picatinny rail, the other on top of 12 o'clock knob.

I've never tried "truing" the targets to vertical...do y'all use a plumb bob to align targets?

I have been "muscling" the rifle to the target...I noticed this on my last session. I would remove my trigger hand completely from rifle and the sight would move several inches to the right of aim point. I need to spend more time in "setup" before pulling the trigger the first time.

I know that occasionally dry firing with pistol can reveal a "flinch" trying to oppose the muzzle flip. I suspect dry firing with rifle will reveal some similar reaction.

Question: How many rounds do you recommend sending down range for a single, quality shooting session?

Many thanks again!