I was advised by a number of gunsmiths not to get 1/2 unf thread on calibres larger than the .22 centre fires as this is not strong enough and could cause problems.
as paddy said, as big as you can go, just stick to one of the normal thread sizes ie M14, 5/8 UNF etc and you wont struggle to find a mod with the correct thread. A good 'smith should recommend an appropriate thread size anyway.....
sorry to have asked a question covered before, but I'm really new to the mod arena...
That's right you don't need a shoulder for the Moderator to butt up against so just thread the outside diameter of the muzzle taking as little off as possible .
Sheesh I wonder how many times this has to be covered .
I think you must have misunderstood my comment - when I said 'In basic terms, you want the biggest thread the barrel will take', being an engineer, I take it as read that this includes a decent location shoulder.