For .22, they currently only have .2161 and that what I received even though I selected .2173. Something it up with the .2173 and hasn't been available. Other calibers may not be an issue.
The 3 Sekhmets I have are dead on accurate, but thats about it. The software is horrible. Tested all 3 with with my SSI TECHNOLOGIES MG-9V and do a handshake within 0.25%
8 definitely gets beaten up. You will know that whan excessive air escapes through the hammer chamber vent holes. A loop always helps for how tiny these o-rings are.