45 2.1
Active Member
Bob, I have 12 brass moulds and the MP 30 sil is the only one that gave me fits. Joe and Tomme also had fits as you'll recall, we had this discussion.
Joe did the same thing the rest of are doing now. He bet me a rifle that I would have trouble casting with it...... I didn't take his rifle though (which I could have done as I had no trouble and have cast with it quite a few times now), but I did tell him what he was doing wrong (basically the same as I posted above). Since then he has cast a few buckets full of them with no trouble and he is shooting some exceptional groups with them (ask him, he'll admit he was wrong). The mold does not have square lube grooves, they have grooves with a 15 degree draft per side.... the same as any other MP mold I've did that has squareish grooves. The problem you guys are having is too much heat in the mold (yep, it's a big hunk of brass that gets hot and doesn't cool nearly as fast as it needs to).... use a fan to cool the mold with the lead and sprue on it and turn the pot temperature down. The key is to have the sprue freeze in 4 seconds or less after you stop pouring.... three seconds is better with this mold. You guys with a infrared thermometer should check the temps out.