With what some of these wacko sellers want for once fired brass on places like Gunbroker , I think you’d be better off buying some Nosler ammo and then you’ll have the empty brass afterwards. I also think once fired by you in your gun is better than supposedly once fired from someone else in who knows what for a chamber.
I make fireball brass out of 223. I have the Redding form die. It isn’t exactly cheap but will pay for itself 10x in no time. It’s stupid what fireball brass costs when it can be made from some of the cheapest and most common brass on the planet.