11/14/2022 0 Comments 276 pedersen ballisticsThe pressure stated in the article gives a muzzle velocity scarcely higher than 2,500 ft/s, far short of Hatcher’s value. I was unable to reach the velocity stated in Hatcher’s Notebook without reaching a pressure of at least 53,000 PSI. I plugged the dimensions of the cartridge, the bullet weight, and barrel length of 24" into an online Powley computer to see if I could replicate the original performance. Weighing one of my pulled bullets, I got a bullet weight of around 126 grains. Using CAD software and this cartridge diagram, I modeled the case volume of the cartridge, which resulted in 47.4 grains case capacity. 276 Pedersen at 78 feet as 2,690 ft/s, which works out to 2,740 ft/s muzzle velocity. Hatcher’s Notebook gives the velocity of the. This is quite low, lower even than 7.62x39. This article gives the peak pressure of the cartridge as 19 long tons per square inch, or 42,560 PSI. For a cartridge that’s so well documented, the.
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