Gordon, when you find time please do send me a few more pictures of your barreled action and let me know whether I am allowed to post them here on this forum.

In the meantime thank you for checking the spacing. Would you mind if possible to also do one or two pictures where you hold a guide next to the holes to show the spacing also in a picture?

Please also let us know what in particular you have. You said you have a barreled action. Does this include the bolt, trigger group, magazine, rear sight, etc. or any other parts - or is it really only the receiver with a barrel? And is the barrel still full military length, trim (meaning original front sight, no rear sight on the barrel added by bubba) and caliber?

Also a more general information which might help you in researching, the full designation for your action is Ross M1910 Mk.III* (or M10 Mk.III*).