As far as MV? I don't bother to check. They're all going in the same hole and that's what counts. (for me at least)
Havn't bothered to drag out my Chrony in years. Might do some checking just so I can satsify other folks curiosity.
No where close to max loads. I like to leave myself some "wiggle room" in case there's a temperature shift. Brass lasts a long time and no pressure signs EVER. A little holdover with no scope adjustment change and I can hit steel out to 440+ yards. I don't want to mess with a good thing.