Hard one to answer, I've seen them work really well and then on the next rifle do nothing at all.
I suspect a couple of possible issues might be cropping up here, one being a mechanical issue with the rifle that the tuning weight helps cancel out or another possibility is a technique or operator shooting style that the addition of some weight on the barrel helps with. Also, it might be a confidence thing that some shooters like?
The best bit of advice is if you identify what is available in terms of tuning weights, then grab a piece of lead sinker about the same weight and a hose clamp and wrap the barrel with tape to protect the finish and then stick the weight on. Lost cost test to see what it does, if it works get the fancy version if it doesn't not much invested.
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