When 10 gauge is still not big enough time to step up your firepower.
Why not touch off an old school 4 bore shotgun?
Check out the recoil and power of this grand ole 4 bore in action and in slow motion.
YouTuber The Gun Shop got a chance to try out a vintage single shot 4 bore shotgun for himself. With one might blast shot in a large volume gets air time to extended distances. No wonder these punt guns and even larger versions used for market hunting were so devastating on flocked birds.
If you ever have a chance to shoot a massive weapon such as this by all means do so. It indeed looks massively fun to say the least.