I am a righty, but my the vision in my right eye, even corrected is poor enough that I can't see the front sight, so I started shooting lefty about 20 years ago.
So now I can shoot either side. I have a number of levers, which helps but only 2 LH bolts, a CZ452 and a Browning micro-hunter in .243 I can shoot RH Bolts, but I can't keep on target while racking the next round in. Handguns are no problem, either side. I do notice that if I am not paying attention, I always pick up a firearm with my right and then transfer it to my left.