I use the 7C easily at 10x for hold overs and unders. Something people should try is that if they can not see the reticle well enough to turn on their illumination. It helps to be able to see the reticle better against the targets. I know we have the "I don;t need illumination" and "I don't even put my battery in" crowd here but they don't know until they try it.
And I have shot a lot of .22 matches and just like centerfire my power rarely goes below 10x. Mostly 10-12x and higher for small stuff. Not sure what matches get shot in Canada but 8x is very rarely used.