I remember reading or hearing that for gas powered semi-autos you should expect muzzle velocity to be 100fps slower than published velocities. Is that correct? Specifically, I'm talking about a Remington 742 in 30/06 (22" barrel). The factory loads state 2810fps as the muzzle velocity but I'm thinking that I might as well subtract 100fps due to the semi-auto action plus another 50-100fps since the claimed velocity is probably high (based on a 24-26" barrel, perfect temperature, and just a liberal claim in general). Does that sound about right?