From these pics if the receiver is the same other than being cut back for the 308 trigger guard and magazine, then it looks like the 308 hammer axis pin is higher in the receiver.I can't tell if the front to back placement has been moved. A measurement from the top edge of the receiver would show if the 308 hammer pin placement is different and maybe a measurement from the trigger pin. Maybe it is the same but raising the hammer pin would make sense to speed the lock time of the action and it would use a shorter hammer. One 308 pic shows the relationship to the selector lever. This might help when compared to a 223 rifle.