Airgun barrels & power potential of given platform aren’t always suited to slugs. I’ve tested quite a bit, and feedback from slug manufacturers is invaluable.
First let me say you can reach out way more than 100 yards easily with .22 or .25 slugs. How’s 300 yards hitting 12oz cans? It’s easy for slugs.
You’d need FX No Limit rings and a scope w/ a lot of elevation. Or shoot on minimal magnification.
I’ll tell you now, NO factory produced airguns can send slugs like a HP Condor, Sumatra, EDgun Supermagnum, or A RAW w/ the right barrel & blast chamber milled out.
Heck my stock Gen 2 Marauder can send certain slugs extremely well.
These TC base HP’s from Griffin are 19 grains .217” and that base is forgiving from a choked barrel. They come much lighter, or heavier up to 33 grains. Are you gonna be hunting varmints/pests or just targets? Because if hunting, yes slugs need to hit hard to expand. Unless you get the LDC w/Delrin sphere that acts as a piston. It also displaces weight. These slugs explode on bone like a solid RBT does when it hits a brick backstop.
I don’t know what caliber, distances or targets/game you’re interested in.
I know I’m having fun with .22 & .25’s but a very special .257 will be my main slug rifle.
(2) 0.750” OD Lilja barrels on a Scandalous action. A 28” 1:14 sending 86 grain RBT’s 1K+fps & a 32” 1:10 for heavier ULD .257’s.
He makes a .338 that carries over 900ftlbs to 300 yards if you’re interested in bigger game. I don’t think I need that. My State probably won’t ever legalize air for anything but Varmints & Small Game. I’m mainly a long range cow pie plinker anyway.