They don't. What you perhaps see are barrel weights to balance the rifle. Even the top guys have just only got into batch testing. 10m for an air rifle is not much test of it's mechanical ability and much more about the shooter. The bull is effectively 5mm wide. If you're having trouble hitting that then it's not going to be an unproven theory that's going to help you out.Originally Posted by Artfull-Bodger
It's more prevailent in other longer range disciplines, but as BB has said, there's really not a good scientific approach to the testing that apparently shows it.
I've got a weight at a point on my comp rig barrel. I'm not wholly convinced about it's effect, and despite trouble shooting reg's, pellets, brakes, valves, springs etc, it has never moved even though i've changed a lot of other items. The reason for that is that when everything is as it should be, it's not making any difference. The groups are as good as I can get them. It's there still because I have to remove a brake or barrel to get it off.
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