I've been having a bash at 25m benchrest with my .177 PCP. I've read the targets should be scored based on the size of a .22 pellet by plugging with a special gauge. Link to what I think I'm talking about below. Sounds like a good way to get my score up a bit Is this what is being described please? And if so, I know this is going to be a stupid question, but how do you use it exactly?

Cheers in advance, Richard

https://www.intershoot.co.uk/acatalo...Gauge-124.html