Thread: The Importance of Using the Right Data

Originally Posted by grandpamac

Greetings Moa Hunter,
IMR4831 was not offered to the public until the early 1970's. The original powder, although made by Dupont, was clearly slower and some comparative tests have shown this. Originally called just 4831 the H prefix was added when IMR4831 appeared. O'Connor developed his loads. In a letter to Ken Waters in the mid 1960,s O'Connor referred to the powder as No4831, clearly the Hodgdon offering. The Hodgdon/ ADI quotes pressure either in CUP or PSI for almost all their load data, one reason why I prefer it.
Regards Grandpamac.

What I meant in my former post about 'a guess' was regarding the powders used for proofing. Personally my guess is that the powder used for proof loads would be similar in burn rate to the powders that are expected to be used by ammo manufacturers and potentially reloaders in that cartridge. Thankyou for the info on powders, any info that helps keep us safe is welcome. I have some of the older early 90's 2213 and wondered why my results dont match other peoples results - now I know.