Hello everyone, i bought a Victor Sarasqueta sidelock model 6E yesterday. The right barrel is marked 18.5 and 18.3 and choke, and left barrel is marked 18.5 17.2 and choke. The choke gauge measures the muzzle chokes for right barrel as 1/4 and left barrel as 3/4. I know 18.3 and 17.2 stand for muzzle chokes( but i am still not sure) So what i am wondering is , 18.3 over 18.5 means 1/4 and 17.2 over 18.5 means 3/4?