My point was that if you have a BP rifle like a front stuffer then there are ways to obtain the correct powder it was designed for. Just as Don posted, Buffalo Arms is shipping BP there.
I would try making my own before shooting a sub, they are just like everything else in this world that wants to play like but not take the steps to do so. It's much easier to just say, I can't get it.
I had a gunsmith who did all the warranty work for EMF ruin a brand new TTN shotgun of mine by using a sub in it.
I told him that I shot nothing but 100% BP in all of my guns in the SASS matches that the gun was to be used in. He advised that he had a friend that shot BP in SASS matches and he would get some 12 ga. shells from him. Well, It seems that most who shoot the subs tell everyone that they shoot in the BP classes. A rule that I would liked changed and only allow the real thing.
The gunsmith shot my new shotgun with the subs, boxed it up and shipped it to my FFL via a 5 day delivery. I almost fell over when I opened the box. My new shotgun had barrels that were solid RUST!!
I sent several pics to the company and they fired that gunsmith and sent me a new gun. Had he used real BP, my gun would of still been good.
The investigation turned up the reason for the Rust, it seems that the BP ammo was actually loaded with Pyrodex. Later David