People have posted on here about bad liners. I know my impact from Spaw didn’t pass his testing and had to order a new liner before he sent it out to me.
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Clean the barrel...if you see a lot of lead fowling (like I did) give the barrel a nice polishing with some diamond paste. I used 5 micron then 3.5, I now have a laser. Cant be sure it will help you but it won't hurt, plus you won't need to clean as often. I was seeing groups all over the place, after cleaning and a little tuning I get this at 50 yards using 18grain JSB's .22
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Clean the barrel...if you see a lot of lead fowling (like I did) give the barrel a nice polishing with some diamond paste. I used 5 micron then 3.5, I now have a laser. Cant be sure it will help you but it won't hurt, plus you won't need to clean as often. I was seeing groups all over the place, after cleaning and a little tuning I get this at 50 yards using 18grain JSB's .22
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Sounds Like you own a Wiked Edge Sharping System. Diamond past 5 micron and 3.5 for your strops. Balsa or leather?
Ask me how I know....
Eamon