It should have the calibre stamped on the left side of the barrel just in front of the receiver.
Had a single shot 6 PPC I bought new in 1989 by special order. The bloke I sold it to says it still groups around .2 MOA for five shots after 1600 odd rounds. Not many of the single shot rifles in 6 PPC and .22 PPC were imported into NZ. The magazine versions were more common and even then, not that common.
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