Our 17-2, which has become something of a problem child revolver, appears to have chambers that are not finished reamed/polished. With clean chambers, 40gr CCI's have to be given a light touch to drop in the last 1/16". After a modest amount of shooting, extreme pressure must be put on the rear of the cases to make them chamber. With the chambers clean, dry and under appropriate lighting, the rear 1/3 of the chambers are perfectly smooth. In the front 2/3's you can clearly see circular machining marks in all six chambers. These machining marks can also be felt with a dental pic or similar tool. Is there any home remedy to fix this? We use this revolver for 22 steel plate matches so doing a reload without having to muscle the shells in is important. This was a 99% gun that showed little evidence of being fired much if at all. But given all the problems we have had with it I suspect it was produced right before or after a major three day holiday.