Either the OKCGC timers are not adequate or the sensitivity is set too high on them. Several times when shooting steel challenge we have had issues with .22 rifles. At the last match we ended up using my timer after the first stage. On the first stage we had problems with 3 guns. After that we did not have an issue on any guns. I even ran my PCC suppressed on the subsequent stages.Now that I think about it, you may have even been on our squad.