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I've fiddled with light loads a bit and found that at 80% and above results are good but can burn a bit dirty when you go below that. I had seen Johns note in Handloader plus the original article....

This got me thinking. Velocity and pressure are quite linear within the normal pressure ranges so I gathered up some data for 150 grain projectiles and my calculator. In 1976 Dupont listed 44.5...

It would be best to think of IMR4895 and H4895 (AR2206H) as different powders as you propose. True they are similar in burning speed but each can be slower or faster than the other depending on what...

Greetings again,
Cross checked with some of the older CUP data for the IMR powders and the current data is clearly hotter. Where the data for both powders is in PSI the data is mostly closer. In any...

Greetings,
You will have noticed that most of the Hodgdon data for the older projectiles has pressure expressed in CUP so it could be 30 plus years old. The IMR data has pressure expressed in PSI so...