Thanks for posting the warning and your data, BDB. The differences with some combinations can apparantely be substantial.
Did not think it could be that much. Just never know, it needs to be checked.
I usually avoid using SPP brass loads for other than practice, but using 6 or 7 different common powders I usually only experienced a ~ 8-15fps loss when using SPP brass with the same load compared to LPP brass. Used mostly FED, WIN, & CCI primers.
I bump the powder drop up a tenth in SPP cases to accommodate....may need to rethink that.
Another thought... Were you getting good center hits on those SPP?