Nothing spectacular. Some rifles will function fine with the ammo, some will not. I've shot a few thousand rounds of Wolf steel cased ammo through my AR and it ran just fine. I would think Tula would be along the same line.
A lot of people shoot it and love it. Same with Wolf. I personally don't care for steel cased ammo but that's just me.
Some people will argue that there are a bajillion ak-47's In the world that are perfectly happy eating nothing but steel cased ammo and their right.
I don't care. I don't put steel in my chamber.
Good ammo for an AK will shoot fine out of an AR just don't shoot to rapidly. The cases are coated with a laquer and because an AR 15 is a direct impingment system the chamber heats up and the laquer can act like a glue. We had to use a brass rod and a hammer to beat the case out of the chamber. That was 1 out of 200 or so rounds and only after we started shooting a lot more quickly. So I would say for just minor plinking your perfectly okay, but no go for much more than that with an AR. Obviously if you had a piston driven AR they would be perfectly okay.
If an inline is just like a flintlock why don't you get a flintlock so you can hunt more seasons?
Nothing melts off of a lacquer coated case. People have posted that they've taken a propane torch to a spent case and can't get the coating to come off.
What happens is the steel cases do not seal as well as a brass case in the chamber. Because they do not seal well, you can get carbon build up which may cause a case to get stuck. The remedy is to scrub the chamber and continue shooting.
This is a brass case that became stuck after firing steel cased ammo. The stuff on the case is carbon build up, not lacquer.