The R.E.A.L. Bullet was designed to start easily and perfectly center itself in the bore. The driving rings on the bullet are a smaller diameter at the base of the bullet and increase in diameter as you approach the nose. A regular starting tool will make loading easier as it would with any other muzzle loading projectile.
These bullets need to be cast from pure lead. If you use an alloy like wheel weights the bullets may be very hard to load.
