Bought this a few months ago (I think it was October) used from a local shop, and didn't get around to firing it until November, I think. Put 50 rounds each of .38Spl and .357Mag thru it. Had quite a few keyholes in the target afterwards. Been busy and haven't gotten it to a gunsmith yet, but last night I grabbed it and a bright flashlight and, after unloading it, took a look at the crown. Crap... The marks are 108 degrees from each other, you can tell from the position of the front site in the pics. Is that the cause of the tumble causing the keyholing? Is there any hope? Or do I have a $550 paperweight?