We found the same issues for some of our imported products. The practical importation qty was so high, that we couldn't get enough turns to make ROI. So, the big stayed big.

I actually think a savvy internet sales site that dealt in vintage waterfowling kit, might make it. Maybe not.

Over all, I think RIO wants it all, so they might do some batches of 2.5's someday. It just feels that way to me. I mean, why wade in to a mature market with Bismuth loads?
If you are going to sell them, might as well make a load that's exactly what vintager's want.

Out there doing it best I can.