yeah I am doing the same with mine-not key holing but spraying. Done a few things and have a handful of reloads to try but also have put a piece of rubber between the barrel and fore end to see how that goes.
Not keyholing them though.
Apparently you can also do a barrel stub with another barrel on the original. probably better if you wanted a completely different cartridge and doubt it would be more cost effective than the criterion barrels. Bugger all of those P14 barrels about let alone good nick used ones.
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