Originally Posted by Shortmagman
I think that you should try either IMR-4831 or H4831. On a burn rate chart IMR is a little faster and H4831 is a little slower. In my experience Magpro is quite a bit slower than AA3100.
Magpro was developed for the shotmag cases, and other slow burning high density loadings. Shoots well in the 270 mag case. Meters extremely well in both my measurers. Seems to like the heavier bullets best.