You know, for the sake of shooting faster with all snipers this might be a good idea if you're using a bipod and need quick follow-up shots. I'm not a lefty, but it would sure beat the hell out of having to lift my right hand off the grip, cock it, and put my hand back on the grip again before taking a shot.
I've been firing real steel bolt-action rifles that way since I was a kid. My uncle is left-handed and a gunsmith... Lucky for me, or perhaps not so lucky as I have learned improper technique. Either way, my left arm is usually just putting pressure against the stock to my right arm anyways. With a quick reach, and moving your head out of the way as to not get whacked in the face with a moving bolt, you're right back looking down the scope for a followup shot almost instantaneously.
I've been firing real steel bolt-action rifles that way since I was a kid. My uncle is left-handed and a gunsmith... Lucky for me, or perhaps not so lucky as I have learned improper technique. Either way, my left arm is usually just putting pressure against the stock to my right arm anyways. With a quick reach, and moving your head out of the way as to not get whacked in the face with a moving bolt, you're right back looking down the scope for a followup shot almost instantaneously.