I'm no ballistics expert but I believe that a 22LR ricochets more than a 22-250.
A 22LR hits with just enough force to cause the bullet to bounce with minimal distortion especially in the solid RN variety. Where as a 22-250 impacts with so much force that a varmint style bullet literally flies apart, each tiny piece having minimal kinetic energy to travel very far or do much damage.
That being said I'd be much more picky about which direction I was facing before taking a shot at the water with a rifle. And I'd want a highly frangable, low grain weight bullet, or better yet a shot gun....since there is not going to be much rat left after a 22-250.