Shelling isn't effected by crit whatsoever. And yes, the damage increase is pretty significant from level 3 to 4. Increases to a shells damage is pretty tough to come by, which is why Artillery is so important.
So artillery is the only way to boost damage of shelling right? There is no skill on the game that can boost shelling one level up?
What about warmstake? Is this affected by crit ar artillery? Or maybe by neither of them?
Man I really love my Jarg gunlance 1x lvl 3 and 2x lvl2 dec slots are awesome. I might actualy reroll lvl 2 grm slot for extra damage and leave it at lvl 1 cause artillery is only lvl 1 gem.