New tech - Grapeshot/Shrapnel

[Inbreak]

An ability for cannoneers to load their cannons with small metallic stuff to defend themselves and their artillery in close combat.
Costs an action.
Range is 1 to 4.
12 damage with 100% bonus to foot melee units.
5-6 turns on invention in advancement center.
Is this legit?

[Endru1241]

That would make cannoneers too versatile.
This unit already deals with everything, apart of melee infantry and cavalry. And even against infantry it can punch heavy blow in 76% cases.
Let's leave it for anti-unit weapon, that won't deal so good with everything else.