hi all..hope this helps..in the philippines we usually use rimfire barrels for our pcp rifles..most of the pellets here brands like super zero,silver streak,meteors,quick silver, have .223/224 head diameter..just right for rimfire barrels..now we tried jsb exacts on the rimfire barrel mine a green mountain barrel for a ruger 10/22..no good its to loose..here is an example of a rimfire barrel using 20 grain silver streaks resized/ unsorted at 60 yards
Kumustah Plinker I have since given up the rim fire idea for awhile. However seeing that I have not been able to sell the barrel it might become a future project down the road.