Hi Edward
Both rimfire and air rifle benchrest disciplines have their own challenges but getting consistently good results in air rifle benchrest competition is the more difficult.
However when you have the right set-up and have established the correct barrel cleaning regime for the pellets being used, then accuracy can be very close to that achieved with the best rimfire rifles on indoor ranges up to 25 yds
E-mail sent with attached info that hopefully should be useful
ATB
John