1891 Argentine Carbine Head Clearance

Hello,
New here but have been reading and learning from here and other sites.
Have just started collecting milsurps of interest to me. Mostly Spanish and Argentine both rifles and pistols. I currently have two 1891 Argentine Calvary Carbines and three Spanish Star pistols (1922 Gardia Civil, 1943 modelo A, and 1956 modelo B)

Just wondering if there is a way to check what the bolt/cartridge clearance of my 1891 Argentine Calvary Carbines is.
Ive read about resizing brass in small increments and testing each for fit, but then I saw a reference to checking the "Head Clearance".
Ive searched here and have been unable to fine the instructions.
All help in pointing me to those directions is appreciated.
:sos: .:help: . :sos: