If the day is as low as it goes and you’re still getting sticking try trimming the top of the shell holder a couple thousands see if that may be frees you up the other thing I would do would be paint the fire case with a magic with a magic marker run it in there and see if you can she visually...
Almost all scopes are mounted at two inches over bore. The old scopes with small tubes could be at one inch. At an informal benchrest league I measured six to ten rifles and all were within a fraction of two inches.
this should work 100 Speer hp B C 2.0 to 2.1 at 3100 fps.
yards mil corr. inch drop
100 ZERO Zero
200 .9 mil 3.5 in
300 1.3 mil 14.1 in
400 2.5 mil 35 in
500 3.8 mil 71 in
this is the second chart . the first one I forgot to correct for range...
Check out used benchrest rifles in the forums Accurate shooter.com and shooters corner.com What a benchrest shooter considers shot out will be way more accurate than a beginning shooter, and some can be had at very reasonable prices.
I've used a lee depriming die for all my rifle rounds so that I can clean te primer pockets. Another benefit is moving the expander ball up near the case neck where you have leverage and if you move it up high the brass stays straight on the ball because the neck guides it.