greenjoytj
06-21-2020, 11:36 PM
I have read that heat expands a mold lengthwise, so bullets that drop from it measure wider diameter along the part line than a 90* perpendicular to the part line.
I have a Lyman 452664 four cavity mold.
Bullets dropping from this mold when sized in my Redding Lubri-sizer .452” die get too much lead swagged up the ogive at the part line.
This prevents the cartridge rim from seating onto the cylinder preventing rotation.
I cast these bullets last summer an just now statted to load and shoot them, there by discovering this problem.
All cartridges were plunk tested in a gauge but not in the actual cylinder they would be fired in.
I’m I casting too hot?
Making the mold grow longer creating bullets with more out of round distortion.
Maybe multiple cavity mould are a bust and I should have gotten a double cavity.
I could try just filling cavity 1 & 4, to try to reduce the mold expansion and out of round state of the dropped bullets.
Alloy used is Rotometals 20:1
Furnace is a RCBS ProMelt-2 PID controlled.
I have a Lyman 452664 four cavity mold.
Bullets dropping from this mold when sized in my Redding Lubri-sizer .452” die get too much lead swagged up the ogive at the part line.
This prevents the cartridge rim from seating onto the cylinder preventing rotation.
I cast these bullets last summer an just now statted to load and shoot them, there by discovering this problem.
All cartridges were plunk tested in a gauge but not in the actual cylinder they would be fired in.
I’m I casting too hot?
Making the mold grow longer creating bullets with more out of round distortion.
Maybe multiple cavity mould are a bust and I should have gotten a double cavity.
I could try just filling cavity 1 & 4, to try to reduce the mold expansion and out of round state of the dropped bullets.
Alloy used is Rotometals 20:1
Furnace is a RCBS ProMelt-2 PID controlled.