I assume you are using a 2” chambered gun, and will need to bear in mind that many of them as built (and passed proof) had relatively thin wall thicknesses.
When, Pre-dating the 2 inch chamber, short cartridges such as Lancaster “Pygmies” were tried in longer chambers shot balling sometimes proved to be an issue.
I'm not using anything right now. I am looking around to buy one, however. I would not shoot 2" in a longer chamber - not point in that, at least for me. But a 5.5# 12 gauge with 7/8 or 1 oz load of shot for grouse - that has possibilities and gives me a reason to surf the gun auctions.

I am planning on going to Tulsa for the first time in April. Perhaps I will find one there. If so, I would like to know how to load for it, before I lay down a lot of cash.