I don't know what he finished with, but I have read other accounts of Bell using the 6.5x53Rimmed Dutch or Romanian rifle and Full Patch ammo, not the Mann 6.5x54. It also said that it was only modern-type writers who changed that to the 6.5x54Mann. due to their limited knowledge of all the preliferation of 6.5's used in those days.
; So - what's true & what is imagined?