I have Hodgdon's 2012 guide. It has a lot of data for H4227. Not so much for the IMR. Their online data is the same as in the guide. My question is can I use the H4227 data and is the Australian made IMR 4227 the same powder now as the H4227?
Last edited by mmb713; May 28, 2012 at 11:04 PM.