By proofmarks yes you can shoot 1 ounce load of #5's from RST (2.5 inch shell)
But there is more to it than just the proofmarks, the actual condition of the gun and its barrels is part of this as well.
The full answer is you should have minimum wall thickness check on the barrel wall by a good gunsmith.
If you have some good gun sense you could perform the inspection yourself, but without a little experience you should defer to an experienced inspector
On choking you get a gauge measure the bore before the choke (2-4 inches back of the muzzle then again the bore at the muzzle and the difference is the amount of choke. Any good gunsmith can do this for you if you do not have a gauge for it
Last edited by old colonel; 09/30/13 04:06 PM.
