If you plan on using it a lot I say just go with the .40 sw round. Simply because of price.
10mm is only a little bigger but is much more pricey and has a lot more kick.
But if you got money why not. Just depends on what you plan to do. I wanted to get a little riffle that shoots .17hmr. But the price difference between it and a .22 for gun and rounds was just too much for just bs ing around ya know
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