That said, there is very little factory ammo available, and performance is stated to be between the 6.
But since its creation, the 29 has seen a number of changes.
Also, experience firing large bore calibers is advised.
Before its inception, the thought of pushing a 75-grain projectile past 1000 yards was uncommon.
So buy bulk ammo where you find it.
Double-base propellant is comprised mostly of nitrocellulose but also has another potent ingredient nitroglycerine added to increase the available energy.