I currently am using 3.2 grains of Universal Clays for a Magtech 148 gr LWC for my 38 Special that I use for Bullseye competition.
The first purchase of Universal Clays I used the Lee Loader VMD formula (powder opening (0.34) / powder charge (3.2 gr)) equaled 0.10625. After weighing I did find 0.34 to produce 3.2grains of powder. The inverse of 0.10625 equals 9.37 grains in1 cc and if divided into 3.2 produces an opening of 0.34 which is correct.
The second purchase using the same opening produced a powder charge of 3.0 grains for a VMD of 0.1133 which means
this powder is more dense?
Taking the inverse of 0.1133 equal 8.826 grains in 1 cc and then dividing 3.2 grains by 8.826 equals 0.36 powder opening to produce 3.2 grains. My original opening of 0.34 according to this is 3.0 grains which is exactly what I optained when weighing the charge.
My question is do I reduce the charge of 3.2 grains downward to account for a denser batch? If so, would 0.1133 - 0.10625 / 0.1133 which equals 6.2% or 0.2 grains reduction?
Thanks
Robert