BACOs are 1:9.5. I believe the older XTRs are 1:8.5 but I might be wrong about that.
Thanks buddy. I was hoping for the 8.5 but I can deal with 9.5...
I've got an XTR Featherweight in 7 mm Mauser, remember measuring the twist with a rod once, and came up with 1 in 8 1/2