I've spoken to my GM and we've come to the agreement that the sorceror can enchant my ammunition with explosive runes.
We play in a very home-brew world, I mean my character is using a musket type rifle and is a sniper. Cragtop Archer + Deepwood Sniper - edited for gun use. - DM ruling.
The side rule of 1 explosive rune per bullet has been issued, as basically I carve a symbol into each of the runes and the sorceror places the rune on top of that.... infinate runes would not fit onto a bullet - my DM's and my reading of it.
The party like it, The DM likes it... It makes the sorceror smile when I do AoE damage as he feels useful on his "off days"
Yeah you could theoretically optimise a Collosus hulking hurler who throws LIBRARIES at the enemies with a bajillion explosive runes... but this is an actual campaign where my actual sorcerer can only cast X a day, and only on an off day or at the end of a day. It's also limited to one per bullet.
Also due to our called shot houserule, a called shot to the face for example is basically an instant kill.
-this rule works both ways-
As a result we're CAREFUL as hell.
So generally I kill things in a round, so adding 1 explosive rune onto a bullet means the guards 2 buddies tend to take 3-6d6 damage when their friends head explodes. I then spend a round reloading and moving. Rinse and repeat.
Addendum:
To the "destroy count to trigger ER" My DM rules if someone tries to erase the text, it's an attempt to destroy the runes and they explode - if the bullet is destroyed when it hits, the runes are contorted/twisted and the same ruling applies.
Addendum:
To the players suggesting I fight further away / start somewhere I cannot be charged.
My effective range is 8820ft, at that distance I can called shot to the eye still... the rest of the party gets a bit bored though.
- I use a modified spyglass of distance to spot targets... it's actually in the form of a false eye.
Sometimes you get surprised and combat starts when you're not ready, so you can't "just start in an unchargable location"
Addendum:
I looked into those abilities that allow you turn your shot into a penetrating line... whilst good, it's very tricky to position I imagine, I don't think I'd use it... but it is excellent.
Whats the ruling comboing splitting with bullets that penetrate? do both hit the next target etc?
-Thank you to those who answered.