...but I LIKE my SKS. I think AKs stink. And I've have an AR to shoot the cartridge IF I didn't have the SKS.
but, on some nuanced level, platform is inextricably linked to this discussion.
lets step back from the cartridge loading and talk a bit about building a rifle.
We'll just take our receiver and action as a given so we can gleefully fast forward to reaming a chamber into a barrel blank.
as we scope out the selection from Douglas, Schillen, HS Precision and others, we will find a plethora of prospective thunder pipes in .308 bore. I imagine we might find a few custom offerings in .311 as well but they won't be particularly plentiful.
What we do find may be at a much higher price point because "custom" ....
Meanwhile, Ivan and Igor, facing the same project just outside Moscow is likely to find suppliers of .310-.312 depending on just how much Kvass Vladimir had with his borsch at their thunder pipe factory.
Heck, it's almost like it's a completely different country or something.
Now, that's where this cartridge comes from, the land of .311 ish.
We'll likely use a .308 pipe, which may lend to your endeavors in your Bear Creek upper (probable .308), while making concessions in your SKS (.311ish).
the cartridge has some other pitfalls. steel vs brass, Berdan vs Boxer that makes careful sorting necessary.
This one just takes some extra work.
Enough that some opt to avoid it. If it were directly my project, I'd be of a mind to load for the special collection rather than blammo ammo. I can't compete favorably with the pallets of former com block sourced ammo.
Where I could win some kind of gain is in loads intended for higher purpose than punching paper and opening Pepsi bottles in creative ways.