Lol I struggled with that statement as well. Neither the Jsb Ko's or the Nsa slugs are great contenders for high expansion. The best expanding slugs by far I've tested are Patriot Javelins/FX Hybrids, followed by Zans. In the losing category for expansion i had Nsa, Jsb, and H&N. Started shooting pests this year with my 30fpe S510 and the slugs are zipping through the birds (low-mid 800fps) as I can hear em zinging through the air after the hit. To say slugs expand better and therefore are safer would be questionable most of the times. I shot a squirrel yesterday off our fence with a patriot slug inside 15Yards and what a mess, inards where out...the slug bounced out its back (60deg turn inside its body) bounced up into the tree and landed back down onto my car or the fence the squirrel was on. Tomorrow I'm gonna look for that slug but it dumped 90%+ of its energy into that squirrel....that is rarely the case! I believe if you want the benefits of slugs you really need to push em fast. A high expansion slug outta my Ghost will not make it past 3.78L water jug # 2.
I stand mostly in awe of where Airguns are at nowadays and I dont hate on any of it (except maybe the big bore,5k fill AEA stuff


) but i have no desire for >5 shots per fill or $2+ per ammo. I'm as serious shooting my 13fpe springer as I am shooting my 53fpe Ghost....I just have to be alot more careful with the latter!