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That is, QuickLoad predicts a 6.5 PRC with a 26" barrel will shoot a 140-grain Berger VLD at 3,177 fps. Here are the numbers for the same bullet, same powder, same barrel in the 264 Win Mag:
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That's 3,164 fps with about four grains less powder, making the PRC every so slightly faster and notably more efficient. Compare instead the Berger 156-grain, same powder, and the predicted velocities are 2,999 fps and 3,008 fps. Hornady's reloading manual reports (
https://press.hornady.com/assets/site/hornady/files/load-data/6.5-prc-v2.pdf) maximum velocities of 3,150 fps and 3,050 fps for (respectively) the 143-grain ELD-X and the 147-grain ELD Match bullets (again with a 26" barrel). Those numbers are very consistent with QuickLoad's predictions above.
Hornady engineered the PRCs with fast-twist-rate barrels (1:8" in the 6.5) and chambers contoured for heavy-for-caliber bullets, so these calibers would be ideal for long-range shooting "out of the box."
On what basis would you say that the 6.5 PRC is "not even close" to the 264?