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Hornady Match 75gr 223 velocity

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The data on the boxes of the Hornady 75gr 223 BTHP Match rounds states muzzle velocity of 2790. Using an 18" barrel with 1:7 twist and the MagnetoSpeed V3 chrono I keep getting readings of 2581 to 2677 fps. I haven't seen specs stating what length barrel was used for the 2790 rate. I would NOT think and extra 2" of barrel would drop velocity 125 to 200 fps. Temps were between 58 to 70 degrees during different test.

Any thoughts?

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Do you know for sure what powder Hornady used?

The powder is proprietary to Hornady. In the past they used a powder close to H4350. Now they have changed to a new blend that they will not disclose.

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