American Reloading powders

i have used powders interchangeable with the reference powders offered, MP625 = Ramshot Hunter, MP638 = Alliant 4000MR, and the Ramshot Tac, sorry don't have their reference #. just do a normal load work up and never had a problem.
remember their reference numbers change with different lots of powder, they don't mix lots of same powder they give it a new number and the number has nothing to do with burn rate so don't think MP625 is faster than MP626 and so on. they are just different lots of powder. also the number given this time won't always be the same the next time for the same powder. just use their reference powders and work up again.
That's kind of screwy isn't it? You'll never know what you're buying.
 
That's kind of screwy isn't it? You'll never know what you're buying.
Yeah, I would definitely start low and work up. A guy on another board thought "similar" was "equal" and went way over pressure, ruining his brass and blowing the primes out of the cases.

Tony
 
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