As I mentioned earlier, you could "calibrate" a homemade dipper, but different lots of powders can have different densities.
Example: Just last weekend, I ran ran out of powder from one lot. I refilled the hopper after empty with a new lot of the same powder and did all the usual measures to settle it, etc. (I do not mix lots). The new lot threw 2 tenths heavier because it was more dense. 2/10 wasn't a too terribly big deal with the slower burning powder I was using, but it could be a big deal if using a fast burner. I weighed on the scale and "re-calibrated" the throw by turning it down to a smaller volume.
Last edited by Taterhead; 10-09-2012 at 20:50..