I cast my own using a lee 00 mold.Ok, went to range, balls are all over target at 20 yards. Nothing consistent. .320 in a .31 pocket Colt. On 3 of 5 chambers i can push ball down with thumb pressure. So i am really thinking its smooth boring it. I going to get .323 to try. I see guy’s mention.330 but I don’t see for sale and i dont cast my own, do you buy shot shells and cut open?
I think tow may have a 5 pound box of hornady buckshot in .330.
https://www.midsouthshooterssupply.com/item/000036400/-number-00-point330-diameter-buckshot-5-pounds