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Old January 14, 2020, 02:11 PM   #4
T. O'Heir
Senior Member
Join Date: February 13, 2002
Location: Canada
Posts: 11,931
Hornady Superformance ammo used to be called Lite-Magnum. It's hot ammo to start with.
All ammo velocities are averages of loads tested, but the important part is what firearm, if there was one, the barrel length and the environmental conditions of the test day. For example, Hornady tested their .223 and 5.56 75 grain Superformance Match with different length barrels. 24" and 20" respectively. That alone will give different results.
And a 16" will always give lower velocities than an 18".
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