I have a Lee 6 CAV 358-158-RF bullet mold that I've had for several years now that is suddenly casting bullets with fins mostly on the nose. I'm at my wits end with this problem. I've inspected this mold using magnification looking for lead or minute specks of lead, the mold seems to be very clean. I've checked the blocks for warping, don't find any warping. I changed mold handles, I've changed how I hold the mold while I'm pouring lead, careful to avoid the sprue cam lever while pouring lead. Nothing seems to matter, the mold is still, sporadically casting bullets with fins. I've cast single bullets to isolate which bullet cavity is the culprit, but the finning problem migrates after I identify one or two cavities as being the 'problem' cavity. Before I junk this thing, what am I missing? Oh, I also clamped the blocks together in a heavy vise with as much pressure as I could leverage for 24 hours to see if that would help. It didn't. Open to suggestion. This is really puzzling. This mold has in the past worked well, casting very nice bullets. Initially I did find lead in the mold preventing the mold blocks from closing properly. That's what started the problem. That lead contamination on the mold blocks is long gone, but the problem remains. Don't know what else to do, what else to check...JJ