Mine are undersize and with bore luib, they go down with a gentle tap with the wood ball starter. As you know, Enfields have progressive rifling and they are tighter at the muzzle.

Thanks to everybody who chimed in here and I learned a lot. Now I need to understand what the battle sight setting is. 200 yards, then 300, then 400 yards?..
Flip up sight? I understand that the Brits had to shoot at a bull's eye and hit it 7 times out of 20. This was up 1,250 yards.

Not bad for a 500+ gr minie ball with 68 grains of BP