What are your accuracy expectations 50 yds or 100 yds?
What shooting disciplines are you shooting?
CZ MTR 457 is guaranteed by manufacturer to shoot .5 inch at 50. Any CZ will do this with decent ammo. My CZ457 MTR can get .3 on good day. My custom Win 52 and Turbo get 1/4 to 3/8 groups with right ammo. Groups measured with caliper outside to outside edge less diameter of the bullet (.224”). I’m looking for five shots in one hole no wider than 2 bullets which is roughly 1/4” group. I lot test my ammo at the Lapua lab or through Killough,
These sizes are the average for a number of ten-shot groups outside-to-outside dimensions. Center-to-center that's about .213 - 251" and they are what may be expected with a very good rifle/barrel and good ammo (shooter and conditions aside).11-12 mm @ 50m
Thats not correct. ARA 100 ring is 0.50 inches at 50 yeards which is equivalent to 1 MOA1/2 moa
ARA Unlimited