Any idea on how how a Gunbreaker Rotation would be set up?

[Arcana]

Yeah it's going to take time and experimentation.

Rough Divide (per charge), Blasting Zone and Gnashing Fang have a 30 sec cd, while Sonic Break, Bow Shock and No Mercy have a 60 sec cd. That mean that you should always, without fail, line up No Mercy to fit all of those into it. That is IF the No Mercy buff affects the DoT effects. I am too stupid for math so I am not sure if that 20 second window is JUST enough to fit everything in or if its larger.

So in this badly put together case, with me not knowing which attacks interrupt combos, that's important, my main burst window idea would be:
Use the Keen Edge combo to store up 2 cartridges right as No Mercy comes up.

No Mercy > Gnashing Fang + Continuation Combo > Burst Strike > Blasting Zone > Sonic Break (?) > Bloodfest > Burst Strike > Bow Shock (?) > Burst Strike > Rough Divide = 5,988 Potency (probably wrong)

If you dont have "No mercy" available, then you have to use a cartridge generator combo obviously.

For short combats i think the starting rotation should be:

Bloodfest (90sec) > No Mercy (60 sec) > Sonic Break(60 sec) > Gnashing > etc... to take more profit on the DoT damage from Sonic Break.