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Geotech,
Peter is correct that the 527 is the bore( not groove or bullet) diameter. This mark is very often found on 22RF rifles, sometimes 6mm Flobert. By shear numbers, it is likely intended for 22 LR ammo, but early ones may have been intended for 22 Long. The 6mm Flobert cartridge is so close to the 22 RF short, that "shorts" are often used without problems. I have a combination gun with more modern markings, that is clearly marked for the 6mm. Some 6mm chambers are found to be longer than you would think. Whether they are original or were extended later, I can't answer. My own 6mm has such a chamber and will accept cartridges from 22CB to 22 LR. The 22 LR Standard Velocity bullet seems to be stable and hits the target "point on". I suggest you try different types and makes of ammo to see what the rifle "likes". I settled on 22 CB and/or 22 Short, but your rifle is intended for a different use and you might prefer something else.
Mike
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