Miller, the statement you made about 2400 being a "fast rifle powder" is quite misleading. It is a very slow shotgun powder, shotgun powders being what we are discussing. Unique is much faster than 2400 (resulting in higher pressure) and a veiled recommendation to change to such a powder for use in a black powder era .410 is not proper. Since normal .410 target loads run in the range of 10,000 to 12,000 pressure range with 1/2 ounce of shot, I see no reason not to use the classic .410 powders in a reduced shot load recipe as long as performance remains adequate. If pressure slips below good performance levels, the report will clue the shooter in to the bad performance. At least the gun will still be intact.
