I have 3 different Rifles and wondered if there is a way to check shank size without barrel removal?

1. model 110 FP s/n F3672xx Heavy barrel Like a tactical non Accutrigger 308 Long action
2. model 10 S/N F9243xx Heavy tactical barrel 308 Short action non Accutrigger
3. model 12 s/n G1325xx Heavy tactical barrel 223 short action with accutrigger

I need a short action large shank that I can put a Savage 6.5cm heavy fluted barrel from a savage precision rifle. Also, can non accutrigger actions be fitted with accutriggers? Thank you!