I've known a great many small guys and medium-size guys, as well as some very big men of large frame, who could shoot rifles of heavy recoil (375 H&H and up) very well indeed, without flinching.

I've also known guys of all sizes who couldn't shoot a 22LR well without flinching........

In my opinion, the ability to handle recoil comes from having the right mental outlook, and from experience. If you are a trained, experienced, practiced rifleman who loves to shoot, and who always has the right game face on, you'll do well with rifles of heavy recoil, no matter your size.

Mental attitude is a very big deal. As it says in Proverbs 23:7, "For as he thinks within himself, so he is."

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