I'd tried JB bore paste back in the day and have some around.... I had put a WTB ad and a few folks have responded so I should have some to try out, but failing the others, I will give this a go, thanks!Rob, J&b is your friend. Use the red first and give the choke area a really good work out. Clean really well and hit with blue. Repeat choke area. You should pick up 30-50 fps and groups should tighten up. A lite lube on slugs will help. I use synthetic shock oil.
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