58.3 FPE that is A LOT in a .177 🙃🙂 That would be 1046 FPS with a 24 gr slug or 1281 FPS with a 16 gr slug !!!!! CZ barrels does not like high velocities and LW barrels would probably top out around 1000 FPS, if the accuracy still needs to be there 👍🙃🙂