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You don't own any powder? It doesn't matter which powder you use, but you need to determine the volume of the hole in your powder slide. You can do that by throwing some charges of any powder and finding them on the Lee chart. If you can't do that, you can determing the volume of the hole by measuring the diameter of the hole, and using the data from one of my earlier posts http://www.starreloaders.com/forum/index.php/topic,253.0.html Volume of a cylinder = 3.1415 X (radius) squared X Height. Measure the diameter of the hole on both the top and bottom of the slide and take the average. The holes are ususally tapered.As a side note, 2.7 BE is the classic load for a 148 grain 38 Special Hollow Base Wadcutter. If the powder slide has not been modified you should be able to use it for that load.
What powders are you interested in?I made up an Excell spreadsheet to calculate theoretical dwop weights.I clarify this because the Lee chart is a little on the lite side.So sometimes the actual weight can be off a tenth.Paul in WNY