Federal developed some extremely accurate match ammo in the Olympic production. If I remember correctly, the case had a dent in the bottom that supposedly helped distribute the priming compound evenly in the rim.
Aguila advertises they use Eley priming process which contributes to their accuracy.
On the subject of sorting, a trimmed 223 case works well to hold the 22 cartridge for measurement. You drop the cartridge in the 223 and use a dial indicator and surface block or mike over with calipers.
