Simple, powerful, short range, self-terminating cannons.
These cannons make use of the TNT blast from the boosters to activate the projectile TNT, instead of using redstone to do so. This makes it very easy and quick to setup a cannon that can shoot large amounts of TNT at a nearby target.
The projectile TNT also explodes at various times which helps to reduce lag, destroy more block drops, and penetrate deeper into a target.
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