Specifically on the barrel really don't know, the accuacy can be affected by many different factors, but putting that aside the rifle currently shoots about 1.25-1.5" groups at 100. Of course being a pre 64 Winchester it is not free floating (it has the bolt half way down the forearm through the stock into the barrel) Its not been bedded and has had no action work done to it. It is a post war rifle barrel date is 1949.