Does anyone make a 28 ga. slug and how have they performed ? Ken
I would also recommend Ballistic Products for data - and hulls, wads, and eveything else.
Keep in mind the correct bore for the 28Ga is .550in, so besides bullets and "slugs," any kind of projectile you can swage down to .545-.550 inches ought to possibly work.
Someone on eBay was selling a roundball mold in .56 cal I bet could be used for a
pumpkin ball, unless you needed still smaller.