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Old 2nd August 2014, 09:16 PM
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Conor Conor is offline
Never has been banned from sales
Join Date: May 2009
Member of: Nelson & Nomads airgun club
Location: Ardboe, Co.Tyrone.
Posts: 2,657

I'd say from my limited experience, anything from 3.8mm - 4mm work well.
If I had to pick, it would be 3.9mm.

I definitely wouldn't go any tighter than 3.8mm.

BTW a 1.4mm outer ring is most popular and seems to work best.
He who never made a mistake never learned!
He who never missed never shot!
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