Energy is easy Pressure is trickier

V^2*m/7000*64.4

V=velocity in feet per second

m=mass in grains

7000 is grains per pound

64.34 is twice the acceleration of gravity (required because the formula needs to convert pounds (force) to slugs (mass)

velocity squared times mass in pounds times 64.4 yields ft-lbs of energy.

also check

http://www.cruffler.com/BallisticCal...lculator.shtml
or

cruffler.com/BallisticCalculators/BallisticCalculator.shtml

or just google the phrase "bullet energy calculation"

As far as I know, you can only approximate the pressure (without installing measuring equipment into your firearm) The speed of the burn of your powder, the friction inside the barrel (of the bullet and of the propellant gasses) and every other thing.

In the '60's there was a slide rule developed for estimating pressures based on velocity. Google the phrase "Hutton and Powley 'Pressure Estimation by Chronograph' " and similar phrases. Computer programs have made the slide rule obsolete, but not irrelevant.

Remember, only believe half of what you see and one quarter of what you hear. That goes double for what you get from the internet. Even this Maybe especially this post.

Do your own independent, confirming research when ANYONE gives you new facts on the web.

Also remember, even the idiotic stuff might have a kernel of truth buried in there somewhere.

Lost Sheep