Look on Ballistic Products webbsite at their prices for what bismuth-loaded shotshells they have left. Lots of those are 10 gauge 3,5 inch loads.

I do buy 12 gauge mag bismuth ammo now and them for shot sizes I use -- #4s (really #3s), #2s (really more like #1s) and #BBs are way too big for my 1,0 oz loads. 10 3,5 inch gauge is priced above my upper boundary. I presume those 19 boxes are 10 per box.

Niklas