Which slugs have worked the best in a .25 cal. Crickett carbine?

I've not started on slugs with my kc2tac but I have been doing a lot of reading and video research. Seems to be slugs like somewhere between 100 or 150 fps faster than your sweet spot of pellets. With the short carbine barrel you may be pushing the gun hard enough to waste a lot of air getting a slug which is typically heavier with more contact surface moving fast enough to hit its sweet spot on fps. This in turn may give you projectile wash as it exits the barrel. I will follow this to see what your results come out as. Good luck to you.