N/A A question for our British members, and locals too

I have a nice English made Webley Longbow in .22. I really like how it shoulders. It’s my favorite carbine.
However the breech seems very tight. JSB HN seem too tight. Are there other pellets with a smaller diameter?
there are not a lot of people who have this gun so I don’t know if this is normal. I see our new member Tin Bum sells pellet sizers, I don’t know if that is really a solution.
Thoughts and suggestions are appreciated

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