VMD for PowerPro 300-MP

[RealGun]

The Lee Auto Disk aperture charts do not list Alliant Power Pro 300-MP, a relatively new magnum pistol powder that uses regular primers or not necessarily magnum primers.

Based upon my trial and error attempts to find the charge weight yield I needed, I derived a VMD factor of .0660, which is close enough to that of W296 and AA#9 (on the chart) to use the same volumes (cc) to find the disk numbers to try. I suggest you pencil that in to save yourself possible disassembling your powder measure a number of times while guesstimating.

note: While this does mean that the charges (grains) for these powders are virtually interchangeable, the applications may not be.

 

[Kernel]

You might have to call Lee Precision and ask. Otherwise, you can calculated it yourself if you have a known cc volumetric measuring device (like a set of Lee dippers) and an accurate scale. The units are cc/grains.