My rotation is kinda basic but I've only just started, I pretty much keep gauss barrel on at all times unless I need to hit something quickly (spiders in A1) or have to move a lot.

I go: summon turret > hot shot > hypercharge + gauss barrel > lead shot > reload + blood for blood > split shot > hawk's eye + raging strikes > slug shot > DEX potion + wildfire > clean shot + gauss round > slug shot + head graze + reassemble > clean shot + ricochet > rapid fire > hot shot > lead shot > quick reload > split shot > slug shot.