Raimey is right again, but why refer to Austrian proof rules?Here are the original German 1892 rules. If you can decypher the old German "Fraktur", you will note: Crown/S stands for a barrel intended for shot, while crown/G ia a barrel proofed for an "Einzelgeschoß" = bullet. Rifling is not mentioned here.






If you like and send a PM, I can email the original prooftables, containing all the gauge numbers, their diameter in mm and the bp sevice and proof loads.