The temps were at least taken using the same conditions and demonstrate the relative difference in the powders. The cumulative effect over many firings has to impact barrel life. The minimal velocity gain may not be worth it, but the impact on barrel harmonics and accuracy would be my determining factor.
Thanks for sharing.
Really? Have you ever tried to get ANY calorimeter bomb information through freedom of information act? It is not possible because they, the powder makers, will not release the information because it comes under espionage intellectual law.
I worked for ADI, the company that makes the powders you know as Hodgdon Extreme powders and others. I worked in both powder manufacturing and the ballistics lab, even I couldn't peruse the results of ANY calorimeter tests done. All I was told was the batch number and whether or not the latest batch matched canister powder or bulk.
No company shares this information, no company even lists HOW MUCH powder is used in each test…so how is this relative to different powder manufacturers? More or less powder will give differing heat ranges.
Also, regarding powder heat and RQ (relative quickness) numbers, there is no standard that each powder is rated against. Each company relegates their own powder as the control. For instance, IMR has always used 4895 as their base range with RQ 100 and every other powder is then rated with a lower number for faster burning and higher number for slower burning. It just so happens that ADI has always used RQ 100 for AR2206H, which is the same as H4895…this is solely coincidence, no collaboration has ever been entered between them.
Other than those above, I have never been able to find the same information for Hercules/Alliant, Winchester, Vhit or Accurate.
How QL gets this information has me stumped, because I have tried. I can't even get SAAMI reference proof load information…this would be very helpful to me, but not being a member restricts your access. I know the parameters of a proof load, that being a load that is 20% higher pressure as a NORMAL load…what is a NORMAL load?
Anyway, I take all this information, both heat range and burn rate, as hearsay.
Cheers.