They're plated round nose 115 bullets (Frontier) at 28,6mm (1.126) OAL with little crimp and 5,35 gn N350. Though they are at 130 PF out of my 14,5 barrel they feel ' harder' then 124's at 136 PF... But sight recovery / dot movement is much less! Let me know if you need more info. My JP is short stroked with 2 Tungsten/3steel.