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Old 10-09-2012, 20:05   #77
WiskyT's Avatar
Join Date: Jun 2002
Location: North Carolina
Posts: 11,766
Originally Posted by Taterhead View Post
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.
Correct, you have to have some margin. the table that comes with Lee dies shows only start loads for the dipper. It will show powder X with the dipper and say a 180 grain bullet as a start load of 4.0 grains and the dipper throwing 3.9, then it will show a max of 4.9 of the same powder with no dipper recommended for a max.
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