I have been using Winchester cases for .300WM but recently came across an opportunity to purchase a bunch of Black Hills cases - all the same year. I have read all the speculation about who makes the cases for Black Hills and decided I need to test the case volume.
I filled several Win and Black Hills cases absolutely full of TAC (very fine ball powder) and then weighed the amount of powder. There is a 2% volume difference in favor of the BH cases.
So here is my question - let’s just say my old load is 72.0 grains of whatever in the Winchester cases. Does that sort of roughly translate into 73.4 grains of whatever with the Black Hills cases in order to create = pressure / = speed of projectile?
I filled several Win and Black Hills cases absolutely full of TAC (very fine ball powder) and then weighed the amount of powder. There is a 2% volume difference in favor of the BH cases.
So here is my question - let’s just say my old load is 72.0 grains of whatever in the Winchester cases. Does that sort of roughly translate into 73.4 grains of whatever with the Black Hills cases in order to create = pressure / = speed of projectile?
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