It seems we can’t find what you’re looking for. Perhaps searching can help.
Rimfire Calibers
22 LR vs 22 Magnum: Same Pressure, Twice the Case
Both are loaded to 24,000 psi and tested in the same 24-inch barrel. The Magnum's speed comes from a case 72% longer — and its bullet is narrower.
Read the articleRimfire Calibers
Rimfire cartridges compared on pressure, case capacity and published velocity, with the test barrel named for every figure, because the numbers move with it.