As an older reloader, I used BlueDot extensively with the magnums and with excellent results. If you have some of the older Hercules/Alliant powder manuals, you will note many Bluedot loads with magnums..
These days most all such data using BlueDot & magnums have dissappeared. I was particularity fond of BlueDot with 41Mag. There are no loads listed in 41Mag in my 2008 reloaders guide.
With all the other powders out there, I have quit using BlueDot alltogether.
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