My mother is very right-handed, and when my dad taught her how to shoot, she couldn't seem to hit the broad side of a barn from inside the barn. After he noticed she was holding the rifle right handed, but leaning way over to use her left eye in the scope he had her switch to shooting left handed, and she immediately shot very well. So like MLF above indicated, you could shoot lefty and do well, it'll just take some getting used to. I also know of other lefty shooters who use right handed rifles, they've just learned to work the bolt by reaching over the scope with their left hand, so I'm not sure you'd need to buy left handed rifles if you start shooting lefty.
