RealGun
Member
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.
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.
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