>>63918669
"External ballistics" refers to the flight of the bullet between the muzzle and the target, which is going to suffer from your 200 grain .357 bullet being flat-nosed and flat-based instead of looking like pic related, a 220gr .308 bullet with a ballistic tip and boat tail. Your .357 will have the trajectory of a brick in comparison, bleeding velocity by the yard and getting pushed all over the place by the gentlest breeze.