My dear old bitsa No.4's barrel is now unquestionably shot out, to the point where even a cheapo Chinese USB borescope picks up the agricultural state of the throat. It just about groups inside a Fig 12 at 300yds but I know the action and bedding will do better than that.
Aside from the Criterion barrels, what are the options for a new No.4 barrel in the UK? I'm more worried about accuracy than originality - this rifle is for shooting!