I presume you mean for the Long Lee type action like your one, mounting is much easier & can be done without drilling the action on the CLLE & SMLE type .

I have not seen a light, later barrel profile like your's on a dust covered bolt action before.

Most use a side mount & you normally have to remove the dust cover, like these ones, not that this rifle had a dust cover.

Some others, this is one of our members, Dust cover removed.

More Dust Cover removed

Purdy Type, seen here on SMLE .

And this on a Gibbs