Chris,

Welcome to the frustrations of shooting a vintage rifle. I have had that experience several times until you hit the right combination.

To shoot best, a hard cast bullet needs to be 0.001" over but from even if slightly undersized, shouldn't miss the target. For those that hit, were they head on, ie, could you detect a wobble by a not completely circular hole?

FYI: I usually initially shoot from 25 yds and, for a double rifle, shoot unsupported because I get bad groups if shooting from a rest.

From what I have read, a number of the "9.3x72R" were actually 9.09mm or 9.1mm. That is, they are bored for a bullet with a diameter between 0.355" to 0.359".

I corresponded with one of the DGJ writers who advised that a number of his guns were actually .35 caliber; that is, 9.09x72r.

Perhaps Axel can elaborate.

There is an article in Rife that discusss a buchsflinte won in auction that turned out to be a 9.1x72r.

Thanks for reporting and best success next time.