Daryl,
You are right, these are dirt cheap and the guy I got these from told me that he had used them on guns before and that they shot very well. They are made from 4140 Chrome Moly, nice inside and said to be very accurate, so what's not to like? I hunted a long time to find a good source of good rifled 12 gauge barrels. With the 1 in 35 twist rate I do believe that they will stabilize a large selection of different bullets, including round balls. Several people have asked to see Photos of these so here they are. Bob