I'm running a Master Caster with a 105 grn. - 360 dia. mold. On this particular mold, when the casting is released from the mold, I get an indent in the bullet that runs from the base up along the bearing surface. Thinking my cycle time was too fast and the bullet was coming out too hot, I slowed my cadence down to the point that the lead had a long time to solidify. This didn't solve the problem, so I changed my formulation to increase hardness. This also did not help. I dropped my casting temp by 75 degrees, no luck. My problem is that, I cast a lot of different bullets with various molds and I only have this problem with this 105 grn. mold.
Thinking that I might have a mold problem, I ordered a new mold from Tom @ Accurate Molds and ended up having the same problem. This crease/ drag line/ indentation in the bullet is so severe that when I lube the bullet, the lube travels up the casting from the lube groove, into the crimp groove and many times to the upper part of the bullet.
It looks to me that when the mold is opened and the casting is spun/jarred out of the mold, the bullet gets creased / indented at the mold joint? Any help would be appreciated, Thx.