Hi everyone, I'm new so don't yell at me if this has been discussed before...I did a search on the forum but didn't find a direct answer...Would I be able to use Slingshot Ammo, 11mm steel balls in my vintage machine?

Here's the site on amazon:
Amazon.com: Chief AJ SLingshot Ammo - 11mm Steel Ball - 410 Count: Sports & Outdoors

These sound really nice. Turns out to be about 6.5 cents/ea...I understand eBay has them for about 3 cents/ea sometimes...

Thanks,
Seth