Originally Posted by
wabi
I guess my point was that whether the modern measure or a BP measure it's still volume.
Changing the volume of the modern measure to achieve a constant weight is just that - changing the volume. A 100gr charge becomes a 97 or 103gr (just a guess) charge when you're trying to repeat the weight of the previous load.
My question is whether the volumetric charge is constant or the weighed charge is constant as far as actual results. Velocity would give a comparison.
I see Wabi's point. It does seem like if you're having to adjust the weight you'll inevitably change the volume. How much, if any, does this change the velocity. And the goal for accuracy is to ultimately have the exact same velocity shot to shot. That said, I'm not sure 2 or 3 grains one way or the other will change velocity enough to notice. Have you ever noticed that changing jugs requires adjusting the scope?
That said, the convenience of throwing loads from a measure and the consistency load to load makes using the measure worth it. It would just be an interesting experiment to see if you're better to adjust the volume to equal the same weight or the weight to equal the same volume.