260rem
you could also try Graeme Spraggon
He is also a Recknagel agent & knows his stuff.

There are a few Sabatti type mounts in that catalogue for the 'express' rifle - assuming 9.3x74 & down?

Give him a bell, perhaps a few photos & measure your quarter rib width.
Worth a try
Tel: 0427 319 589

E-Mail: graemesp@bigpond.com

Cheers