Thank you gentlemen.
I have been looking at drillings for quite some time & the chamberings available have been driving me crazy.

This is a bit of an expensive exercise either way you go.
You cannot afford to buy a money pit of repairs to a gun in bad & worn condition, so excellent condition is one of my requirements.
That commands a premium price as does chamberings in common calibres. Obsolete ammo commands a premium as does the brass, dies & projectiles. I do reload, but to set up for another obsolete round is a cost that may be better spent on a drilling of common calibre.

Just trying to weigh this all up.
My head says get a 12 g 2 3/4 over 7x57 or 06 but my heart loves the old thumpers like 9x70 in a hundred year old gun.
Then my head says 'why Oh why are the 16 g barrels on it only 2 1/2, argggh !

O.M