38 Special vs 9mm: Nearly the Same Bullet, Double the Pressure
The bullets are two thousandths of an inch apart. The pressure ceilings are more than double. One maker’s line loaded in both settles the energy question.
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38 Special vs 357 Magnum: Same Bullet, Twice the Pressure
Identical bullet, identical rim, 0.135 inches of case length apart — and one is loaded to twice the pressure. Why the interchangeability runs one way.
