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You might try and make sure it's really a 1:8 barrel. Perhaps take a cleaning rod with a tight fitting patch, insert it and mark the position with a marker on the rod. Then slowly push it through the barrel, noting the distance till the muzzle and how many times it rotates. Just guessing, but if it's a 10" barrel and the chamber is 1.4" long it should have rifling a little over 8" long...this should give you 1 complete rotation of the cleaning rod. If you get less than one rotation, perhaps it's a 1:10 barrel.
I think a 1:8 should have no trouble with 220gr bullets.
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