I have one, a JES rebore. Its about a 1 inch gun, more than accurate enough for elk. It is a slow barrel tho.
200 AB's, max I can get is 2672.
225 AB's, max I can get is 2504.
Its my timber gun, so not overly worried about it. Worked fine last year, cow being pushed by a bull at about 80 yards.
It still smacks steel at 350 yards with a nice punch.