I have some older (late 70s early 80s) IMR 4227 which is in good condition. I know the current IMR 4227 and the current H4227 are essentially the same powder. However, does the IMR of yesteryear require me to use different data than the current H version?
If I go to their website IMR4227 is not listed as a load for 44 Spl but H4227 is. If I go to 44 Mag portion the IMR4227 is listed and H4227 is not. This leads me to believe they are not interchangeable and of course my original question is still is the old the same as the new?
If I go to their website IMR4227 is not listed as a load for 44 Spl but H4227 is. If I go to 44 Mag portion the IMR4227 is listed and H4227 is not. This leads me to believe they are not interchangeable and of course my original question is still is the old the same as the new?