Cannon using Blast Shot ammo and Vital Strike

[That Crazy Alchemist]

I am building a character who is a Half Giant using a cannon as a two handed firearm.

Can I use Blast Shot ammo and Vital Strike together? Blast shot uses language very similar to the scatter firearm quality but specifically ISN'T scatter as there are also numerous differences, particularly the absence of any language about not including extra damage from precision, vital strike, etc the way scatter does. In fact it even says "it deals it's normal damage on a hit".

Any rules interpretations or even just opinions are welcome.

Blast Shot:

Instead of a single hard ball, this ammunition is a bundle of large pellets, balls, or pieces of scrap metal, propelled a short distance by black powder and attacking all creatures and objects within an area. Both cannons and fiend’s mouth cannons can fire this kind of ammunition. When such a siege engine fires this ammunition, it hits every creature and object within a 30-foot-cone burst. The siege engine makes attack rolls against each creature and unattended object in the burst. It must miss every creature or target to misfire, and a misfire generates the normal effect. It deals its normal damage on a hit, but does not ignore the hardness of objects.

Scatter Weapon:

A weapon with the scatter weapon quality can shoot two different types of ammunition. It can fire normal bullets that target one creature, or it can make a scattering shot, attacking all creatures within a cone. Cannons with the scatter weapon quality only fire grapeshot, unless their descriptions state otherwise. When a scatter weapon attacks all creatures within a cone, it makes a separate attack roll against each creature within the cone. Each attack roll takes a –2 penalty, and its attack damage cannot be modified by precision damage or damage-increasing feats such as Vital Strike. Effects that grant concealment, such as fog or smoke, or the blur, invisibility, or mirror image spells, do not foil a scatter attack. If any of the attack rolls threaten a critical, confirm the critical for that attack roll alone. A firearm that makes a scatter shot misfires only if all of the attack rolls made misfire. If a scatter weapon explodes on a misfire, it deals triple its damage to all creatures within the misfire radius.

[Sam Phelan]

Moved to Pathfinder 3rd Party Products Rules and Advice.

[Kris Myatt 47]

This is just my opinion, as you said, they are welcomed. If I were you, just ask the GM/DM, whatever they want to be called in your group, their opinion on this. If they allow it, congratz! If not, sorry. Personally, I find it an interesting idea. However, looking at the numbers, not sure if I could allow it if I were running a game.

You are correct, the language is similar in some way, yet, towards the end, they are completely different. Also, one thing that could tip the balance, what is the other half of your character? Also, which giant is the other half? If it's human or human sized, I'm thinking this won't work. I'll explain using this link to show comparison.

https://www.d20pfsrd.com/bestiary/monster-listings/humanoids/giants/

Storm Giant: 19-24 Feet tall, that's the biggest.
Hill Giant: 9-13 Feet tall, being the smallest.

So, if you character is in the range of 7-10 feet tall, I would question if they were big enough, or strong enough, to pick up a cannon. Now if they were half Storm Giant, guessing they would be between 8-12 feet tall, but again, depends on the other half, I would think.

This really seems like a question for your GM, really. Not sure if the rules get into that much detail. Personally, I enjoy a bit of realism mixed with my fantasy games. Please post what you end up doing. Curious to find out what your GM thinks of this. Best of luck!