Have you played with the Eriana's Vow Exotic Hand Cannon yet?
It always reminded me a bit of the .600 Zeliska, especially the kick when you shoot them.
Here's a video if you haven't seen the gun in the game: https://youtu.be/uyOYnj5uGw0
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I look closer at Eriana's Vow since you mentioned it and it actually does look like the Zeliska. Cool.