When I was a kid, my ammunition came mostly from garage sales, where it was cheap, and if they had longs, or, shorts, I happily bought it all, and offered my friends as much as they wanted, which, was always politely declined. I had the only gun, the 552, that shot short, long, or long rifle interchangeably.
The 581 does the same thing, but, I wasn’t a kid when I got it.

Best,
Ted