So a velocity test will give me no useful data to determine what's right. My barrel is a 24' and I have no idea what their test was.

I weighed out 2 x 80 grain by Weight loads and i was about to go out back and shoot them from my new Accura MR-X, to see on the Blackhorn chart, did it act like a 100 by Volume Load (which I was measuring) 1855 FPS for a Hornady SST-ML Low Drag? Or did it act like an 80 Grain by Weight Load (which on their chart would have been approx 114 grains volume) and measure 1994 FPS? As I headed out my back door I realized the obvious problem and turned around, came back here to post. I threw a charge of 84 Grains Weight also and got the same info in the TC Powder Measure, but in my test tube style measure from Thor that shipped with sizing bullets, the volume is from 98 grains to 105 grains depending on how you shake it. “Volume” is based on the TC powder measure I show in a photo in this post. I had expected the conversion of 0.7 (though I know it varies somewhat).ħ0 grains weight = 88 volume. I have consistently found that my bottle of Blackhorn 209 weighs 80 Grains weight to 100 grains volume.

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