I have several. I don’t know how round they are, mathematically, but they are round and shoot very well in both my rifles and smooth bores. I have some from Smiling Fox Forge, as well. They also make good balls. I would not use the sprue cutter on them. I did that once and that made it a little loose. I just make a few strokes with a large file to smooth off the sprue.They are much less expensive than Callahan molds. Anyone have any experience using them?