I have a 577NE blank which i want to put on a NO1,i cant get a reamer here in Aust for 577 ne.So might have to bite the bullet [or is it reamer?]and just buy one .Not sure if i should go with a clymer, which they say they will have to custom make ! Do i need a rougher and a finisher etc? or can i get away with just the finisher ?Otherwise i might just have to settle for a Nyati which a fellow poster told me his gunsmith has and build a bolt rifle instead ,Thankyou for any advice

You don't need the rougher to cut a very few chambers.

Use Clymer, Manson or Dave Kiff (Pacific Tool) as all are about the same quality, at least so far as I've found.