Umareex gauntlet 2 ammo .22

I am just wondering what everyone is having success shooting through the Gauntlet 2. So far mine like the JSB jumbo monster redesigned in 25.39. I am wanting some slugs to shoot and look for feedback on what success y'all having!!
Did you have to change anything on the Gauntlet to shoot slugs? This is my first PCP and have a lot to learn.
 
Did you have to change anything on the Gauntlet to shoot slugs? This is my first PCP and have a lot to learn.

My G2 30 shoot slugs well but my G2 25 basically won't do it. I believe the 22 is similar to the 25 in that regard. I wouldn't even bother unless you're not worried about making nice groups. But maybe there is some ammo out there that works. I've tried a lot of slugs in my 25 though.