Hmm. I like this thread but a .223/5.56 round for Airguns is splitting hairs above the .22 and below the .25. I think it is mostly an attempt to shoot the most popular round in traditional firearms second to the .22 rim fire. But that .223/5.56 was originally developed by NATO as a minimum lethality round to replace existing cartridges that had too high of a lethality (if you get shot by say a 30-06 in the leg there is a good chance your leg is either dangling off or mush in the middle). That being said I don’t understand other than the ability to say “you did it” why someone would put this on a PCP. The best ballistics usually run between .26-.27 on long distance/flat trajectory/maximum foot pounds down range, so I think it would be cooler to see someone mimic a 6.5mm Creedmore bore size for a slug or something along those lines.
nah let’s just do .223