That is a airgun only list.... He sells a myriad of PB calibers and twists as well.... The only way to know for sure is to phone Mike and talk to him, there are a LOT of liners (in particular twist rates) that he does not have on his published list.... For instance, he has .224 cal in 9", 12", and 14", and .223" (.22 rimfire) in 16" and 20" twists.... and he has .257 cal in 7", 10" and 14" twists.... In addition, he has a wide latitude of ODs he can supply.... Call and ask !!!!

Bob