That's like using Greenhill twist calc instead of JBM. It might be close, but could also be far off. You can have 2 exact muzzle energies with 2 different burn rates that give 2 different gas volumes and exit pressures. The faster burning powder with less gas volume will give less recoil. It's like having a muzzle brake to disperse/redirect gas with less felt recoil.Cody,
ShootersCalculator.com | Recoil Calculator
An online calculator that calculates the recoil energy, impulse, and velocity of a firearm according to the firearm's weight, powder charge, bullet weight, and bullet muzzle velocity.shooterscalculator.com
Foot pounds of recoil energy and recoil velocity both
John
Oops, just saw your post #45.
Nevermind.