What cartridge are you loading for? Possible that the Hornady has a lower case volume resulting in slightly higher pressure. My experience has always showed the opposite. Lake city has always given me more Velocity than anything else and why I choose to make most of my own cases for other calbers out of the stuff. 250 savage for example gives me an extra 50 fps when I used sized down lake city match 308 cases over standard winchesters with the same powder charge. Check the case volumes between the two different brass types and you will probably find your answer.
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