I don't shoot big 30lbs custom bench guns, I only shoot auto, bolt, and lever guns designed for hunting.
Best individual results I ever got were
#1 Tikka T3 (You would not believe me if I told you.)
#2 Browning A-Bolt (Tight cloverleafs @100)
#3 Marlin X7 (touching three holes on a regular basis)
#4 Tie between Savage 110 and New FN Winchester model 70 (consistent 1/2MOA groups)
#5 1970s model heavily used Browning BBR (just over 1/2 MOA)
DEAD LAST 1990s Model 70 pushfeed (I would measure the groups if I could get three shots to hit the paper at 50 yards!)