Come on you guys we have beaten this horse to death many times. Felt Recoil has no relationship to chamber pressure. It is calculate on weight of projectile (ejecta), velocity and weight of the gun period. If you have a question concerning chamber pressure send a sample to Tom Armbrust but remember the numbers he gives you are good for the tested lot only as ammunition manufacturers change propellants all the time and pressures may vary considerably so long as they do not exceed SAAMI or CIP published maximums.