Custom crossbow shots grenades...help

I'm in prosses of making a custom crossbow that based on PP-19 Bizon, but with "projectile_type_index = 11" it's shots grenades and not bolts, hower it's shots bolts if I put Pistol Crossbow as a base or if equip explosive or poison bolts.Can somebody help me with that issue?
you already changed the script on .unit file to the bow weapon logic right?