Wes/Tex said:
As an example, using a dipper holding an ounce of powder and a dipper holding an ounce & a quarter of shot...
Most of us know what this means, but to clarify for newcomers, that translates to using a 1-ounce shot measure to measure the powder to go under a 1.1/4-ounce shot charge (with appropriate wads in between, of course). That will give you 2.5 drams or 68 grains of powder (approximately, depending on the powder, the measure, and exactly how you use it), not an actual ounce (16 drams or 473.5gr) weight of powder.
mudd turtle, you're going to see this often in dealings with muzzleloading smoothbores - using one measure for both powder and shot. Just remember that both numbers refer to volume settings on a measure, but only one of them will be the actual weight involved (the shot, in Wes's example). BTW, drams are the traditional units of measure for powder charges, and an avourdupois dram is 1/16 of an ounce or 1/256 of a pound or 27.34 grains.
powder/shot volume equivalences
2dr = 55gr = 3/4oz Pb shot
2.1/4dr = 62gr = 7/8oz Pb shot
2.1/2dr = 68gr = 1oz Pb shot
2.3/4dr = 75gr = 1.1/8oz Pb shot
3dr = 82gr = 1.1/4oz Pb shot
3.1/4dr = 89gr = 1.3/8oz Pb shot
3.1/2dr = 96gr = 1.1/2oz Pb shot
3.3/4dr = 103gr = 1.5/8oz Pb shot
4dr = 109gr = 1.3/4oz Pb shot
4.1/4dr = 116gr = 1.7/8oz Pb shot
4.1/2dr = 123gr = 2oz Pb shot
These are the traditional equivalencies given for the same volumes of powder and (lead) shot, with shot size not specified but probably either #6 or #8. Larger shot and/or smaller-diameter measures (e.g. powder measures) will give lighter shot charges. Naturally, any other shot material besides lead would give a different weight of shot (steel, bismuth, tungsten-iron, etc.).
In case no one's referred you to it yet, there is a TON of excellent information about muzzleloading smoothbores at Bob Spencer's site:
[url] http://home.insightbb.com/~bspen/[/url]
Hope this helps,
Joel