Get thee to an Appleseed! You will learn foundational marksmanship skills as well as the history of your own country. The Mosin is a heavy recoiling rifle, not for the faint of heart. You can learn the skills on a 22 and they will transfer well to larger caliber rifles.
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Thanks, I work with someone who would string me up if I don't go to one. I was looking at 22LR at the same time so I could take it to an Appleseed.