I’ve been buying black powder weapons, just in case things gets real primitive. I have molds and I can make my ammo from scratch. After all the fancy brass is used up it comes down to the black powder weapons which have their advantage.
I love black powder shooting but in reality, a winner will be decided before all the fancy brass is used up.
The new black powder rifled barrels are anything but primitive. They are accurate and can throw a huge chunk of lead at moderate velocities. They can run your whole day. But, they go bang about once a minute. That is not good enough to win.