Thanks for your patience 7magcreedmoor. I got ahold of Xray, and here is his reply written in his own words:
7magcreedmoor
Did you go with left twist to have spindrift and coriolis offset each other?
So spin drift is basically the same if we're talking twist be it left or right. Left twists, left. Right twists right.
Coriolis is a different issue all together. If you look at how the earth rotates here in the northern hemisphere, rotating east at approx 1,000 miles per hour. Shooting east the earth is traveling away from the target, making the bullet fall short. Facing West the bullet will land high because the earth is rotating into the target. Shooting north the bullet will fall behind the target because the target is actually moving east. And the opposit is true shooting South. This last case would be where the left twist would somewhat negate coriolis. This would only be at greater ranges.
The main reason for doing the left twist in a mag caliber is what you guys have already discussed, the twist of the weapon. For a right handed shooter it pulls the stock into the shoulder pocket and against your cheek. So it's more managable and recoil management is much easier to attain.
For cut rifle companies like bartlein, it's just a flip of a switch to make a left twist. I wanted to try one so I decided why not try it with a mag where it would be the most effective. So far I don't mind it. If you want to try one, by all means give it a try.
Xray.
PS: 7magcreedmoor, lesvoth here again. I'll just add a little about why recoil management is important to Xray. He hunts alone - without a spotter - so he needs to spot his own shots/hits/misses. He has to hit - it is his job. So whatever seemingly minute help he can give himself in that endeavor, in this case perhaps the barely perceptible "recoil pulse mitigation," - it all helps him do his job.
Thanks again for your questions!