Several studies have found sorting .22 ammo by weight and rim thickness is a waste of time, including my own limited testing.
What really seems to matter is the other end of the round: consistent bullet diameter and alignment. Which is the same in centerfire ammunition--the front is the steering end.
The really meaningful test is to shoot different ammo and see how it groups.
I bought a .22 resizer/hollow pointer tool off D-rock on RFC and was really impressed at the results. All ammo grouped better but some had very dramatic improvement.
