"...doesn't seem very realistic..." It's not meant to be realistic. It's meant to be fun. That's why you see holster rigs that were never seen in the 1880's. The holsters seen in movies and on TV are not historically accurate. Not everybody carried a gun. Nor did most cowboys(who weren't well liked by the towns people). Most of them didn't own a horse either.
"...may have to get a smaller one..." Cheaper to buy a leather hole punch.
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