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Old December 3, 2019, 02:47 PM   #14
Join Date: March 4, 2005
Location: Ohio
Posts: 18,701
Hornady uses the practice of dividing velocities into blocks. It's bound to mean they are having to round things up or down from the midpoint between velocity categories, causing both under and over-reporting of some velocities. I've gone through a good number of their loads, comparing them to other data and found a pretty consistent pattern of them being anywhere from one to nine percent under Hodgdon charge weights and some other sources. There are a few exceptions, but that range occurs pretty commonly. I don't know why that is so, but have guessed that because they are buying powder off the shelf and don't know where the lot they bought might lie in the burn rate tolerance range, they may be making an extra allowance in case their lot is on the slow end. But I don't know for sure.
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