No 1 reason = you can buy the sabot ammo over the counter in any local sports store, and its highly likely that store would offer your brand and load. Maybe even the local gas station in smaller towns!

I reload, when I have to. I don't enjoy it, it is a job that has to be done for certain rifles. I'm always running short of loaded ammo for those rifles too, reflecting my lack of love for the task. Reading about loading either for Brit paradox style guns or bore rifles informs me that it would be even less my cup of tea. I think most fellows are in my camp.

I'm sure you've given thought to a paradox style gun, that would seem to more closely match what your'e looking for. And if you're interested in loading round balls in a double, have you given thought to one of the Pedersoli black powder SxS double rifles or a vintage black powder round ball rifle? I would be a heck of a lot more interested in a black powder round ball rifle than a 20ga shooting round balls, if only for the relative ease loading and shooting and always available opportunity to head out, load up and go shooting.

Its funny, but my thinking on the topic is as near 180* opposite as could be. Not that I don't appreciate your view, just not interested in heading that direction.

BTW, I believe the bullets are substantially larger than .308", close to .45", but I'll see what I can find or cut apart one of my son's 20ga sabot loads.

JPK