Bow,
Its a problem.
I bought a Stoney Point one for my Sako 85, which didn't fit. A member on here (Callie) lives near me and is an engineer. He very kindly turned down the collar on his lathe until it fitted.
I suggest that unless you have access to a lathe and someone to operate it you are best off taking your rifle to you local RFD and trying the boreguides out while you're in the shop. I was promised that the one I bought would fit but Callie skimmed almost a millimetre off before it did.
Cheers,
Bob