Move Creation Workshop

[Jade Harley]

I'm hoping to make an NPC Prime soon for my character to fight, but before I do, I'd like to get some advice on writing his move up properly:

Pile a' Guns (1200)
(Ranged Proficiency, Physical Strength, Area Attack Proficiency)
Steve has a huge pile of double-barrel shotguns and ammo for them carted around by his Secondaries. For the purposes of this move, that means he'll never run out of shells and if a gun breaks he can just replace it immediately. Reloading (or replacing) a gun takes two seconds.
Steve is strong enough that he can handle the recoil of a shotgun one-handed, and as such, he can dual-wield these weapons if he wants to, though doing so imposes a significant penalty to his accuracy.
In all other respects these are normal double-barrel shotguns. All his shotguns are 12 gauge and 48” long. They can be loaded with either slug or shot rounds, and can also be used as crude clubs in melee combat if necessary. The effective range of slug rounds is 90m and their speed is 540m/s, whilst shot can only go up to 45m and 340m/s. The maximum spread of shot rounds is 50".

Because this move lacks much of a drawback, they don't deal quite as much damage as one would expect from a character with as high an ATK as Steve.

The pricing I came up with was:
Base move - 300
Additional ammo type (shot) - 300
Melee functionality - 300
Dual-wielding - 300
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Total - 1200

Dual-wielding would not cost an extra 300. Also, is there a difference in strength between the shot and slug rounds? What is this move's effective range?