received info for for MP-300 from Alliant a year ago for 41 Mag:


Amonette, Ben([email protected])


3/26/13

To: xxx

We have not tested 300MP in this application but you might start with 21 grs and the max should be approx. 23 grs. Be sure and start with the minimum charge regardless of which primer you choose. A firm crimp on the bullet is recommended. Thanks for your note.

I settled on 22.5 gns.,WLP, with Sierra 210JHC and avg. 1394 fps. I remember a wide variation in the fps though.