Ruger Single Six or GP100?

For fun at the range, I'm considering buying one of these two revolvers. I think I'd enjoy the pop of the GP100 more, and having a double action instead of a single action only. The problem? At my handgun safety cl, I started to anticipate the recoil of the .38 special I was shooting. Don't know why. It didn't bother my hand, I don't mind the noise, and it didn't bother me the one time I'd shot a revolver before. But I began to flinch. I've heard that beginners should use a .22 to start with to avoid this problem. I have already bought a MKIII (waiting to actually get it, live in MA, which sucks, long story). Can I use the MKIII for a bit to learn to shoot, then switch after a while of training to the GP100 for fun? Or is it apples and oranges with a revolver and auto, and I should learn with the single six before getting a more powerful revolver?