I want a bigger bang...

[Title_II]

How about a 37mm gun? Rifled, cartridge rounds (not high explosive).

Non explosive? Why ruin the fun?

Trying to keep it simple

I really can't have explosive rounds larger than 20mm here in Pennsylvania unless I start a gun business. In other states you need to register each round that contains more than 7 grams of explosives (unless you decide to get a license) so most average joes stay away from them.

Explosives that are not weapons are fine as long as you use them within 24 hours, such that there is no need to store them. If you want to store them there are requirements and if you want to transport them there are even more requirements.

[Noisydad]

Most black powder clubs (including mine) do a live firing target comp for cannon.

[Title_II]

I haven't seen a large BP cannon fire in a long time. I started looking into them a few years ago but the big ones are several thousand dollars in America . And then they want a few thousand for the carriage.

[Title_II]

We looked into a bit, my dad is a big BP buff, we think it would be heaps cheaper to get one made.
Buy the lump of steel, get someone to turn it and drill it for you and build your own carriage.
Might not be as pretty as an old one but who could tell with that much smoke in the air.
Main thing that stopped the old man going further into it was the cost to shoot it, he was looking at between 30 N 50 bucks a shot

So shoot it once per range trip

Other people will want to shoot it, tell them they have to buy a load since $50 doesn't grow on trees. Honestly, I ask most of my friends to bring ammo when they shoot my MGs. Not that I wouldn't let them shoot my ammo, I would. It just adds up with 4 or 5 people running them all day.

[Rocker]

No one is going to take the opportunity with this title for a "that's what she said" joke?

[Title_II]

No one is going to take the opportunity with this title for a "that's what she said" joke?

When I read it I actually thought he was a chubby chaser

[Rippah]

Has probably been 50 jokes and mods are clearing them out