right VRS left, and gain twist?

[6.5x53.5]

Thanks Catfish, I'm attempting to find out who the techs are on the site. I agree it has something to do with earth rotation in relation to the magnetic poles. As for gain twist that I would think would mutilate the bullet as it arrives into the tighter twist this must affect barrel pressure and motion in a completely different way than the accepted whipping motion. Another one was that cannon round that had 2 trunnion like protrusions that rode two groves down the barrel "Carivelli?" Well we got this far AIN"T gonna qubbile about that!
Again thanks for your input should have polled this one.
6.5x53.5 AKA Dan