So, Trumna (7 formas)

[Nailclipper]

I'd say that it's good but not at Acceltra or Ignis Wraith level. This is the build that I use: https://overframe.gg/build/73809/trumna/coffin-rifle/ (against Corpus it's better to swap Hunter Munitions with Heavy Caliber and adjust the elements accordingly).

Those who want to replace their Acceltra with something else like me, still need to wait I guess. That said, Trumna has a lot of ammo reserve and range so perhaps you can use it for things like Tridolon or Profit Taker (the alt fire would be great for removing adds).

What's your experience with it?

[Annnoth]

It's a bolter with a side mounted mortar and does a good job sounding like it. If that doesn't sell you on maining it, reloading it causes every oriface of the gun and even the disposed magazine to smoke like it's always on the verge of catching fire. By god those reload sounds... like a love child of a portable howitzer and an M1 garand. 

It could heal enemies and I'll still use it. I'm sure there are better guns as you said, but it's still got some power to it (especially the alt fire, jesus all the entrati alt fires are silly), and is pretty reliable when you learn the recoil so it's been my go to.

Being a heavily fire based gun is also a pretty sweet upside.

[GPrime96]

I used 1 Forma on it so far and it’s like any other powerful Rifle until you unleashed it’s Alt Fire which is like shooting out Dynamite. Although if you don’t use a Frame with no Synergies for that Weapon, it can fall off pretty fast against the more durable Enemies like the Armored ones at Steel Path Cambion Drift. I can see myself using it randomly but not enough to replace my Bramma.

Edit: Trumna have a stupid Reload too.