Question: A poster mentioned in this thread, pressure values at 25000 'cup'. What units are those?
The standard unit of pressure measurement is the Pascal...sometimes written as Pa or kPa (for Kilo-Pascals).
Were you guys saying that the .22LR chamber pressure is near 25000 Pa?
For those of you who don't remember, pressure is Force divided by Area. So 1 Pa = (1 Newton / 1 Square Meter).
In this case, we are talking about the surface area of the shell casing, from primer to slug...whic is sooo much smaller than a .45acp shell...it makes sense that a .22LR shell could generate more chamber pressure.
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