I recently got a Walther PP in 380 ACP. I have the shell holder and a lot of 9mm 120 grain cast bullets. I don't have the reloading dies. I passed a couple of unprimed and no powder 380 shells in the 38 spl resizing die and seated the bullets to the apropriate length. They easily fit in the chamber. Would reloaded cartridges (with primer and powder) be safe to use in the pistol? and any suggestion on the powder charge? I only have bullseye and 800X.