Practice.
I'm doubly hampered, as my Low Wall doesn't even have an ejector. I use a buttstock carrier as well, and practice reloading drills with dummy ammo. It doesn't help that the scope gets in the way, so it really makes you focus on the fits shot - which is part of the whole cult of the one-shooter.
I've developed a specific set of moves that work OK, but I would not hunt dangerous game with a single without an ejector.
Honestly, I wouldn't hunt dangerous game with a single - period.
