After 5,235,423,464[1] requests for nuclear warfare in Create Big Cannons, it has finally arrived in the form of this addon.
(Thanks to BlackeagleYT for the awesome video!)
This mod adds one thing: The Nuclear Shell. Functions exactly* like the Nuclear Bomb from Alex's Caves, but in shell form! Perfect for deleting people's bases from hundreds of blocks away!
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[1] - Source for this statistic:

* - Unlike the Nuclear Bomb from Alex's Caves, the Nuclear Shell cannot be ridden. However, it can still be defused with shears, and will activate nearby Nuclear Sirens.
All Versions
+ Add Version- Updated for the latest version of CBC (5.5.1)
- The properties of Nuclear Shells are now configurable via datapack, including explosion strength
- Nuclear Shells are now fuzed on the front/top (it's more fun that way)
- Nuclear Shells (in entity form) can be manually activated with Flint And Steel (good luck getting out of there in five seconds!)