Loading my first batch of 6.5CM for my Ruger American. Using load data from Hornady’s 11th manual for 140bthp’s over 35.6gr of H4350 to use a COL of 2.8”. When I did this I had trouble closing my bolt. So I reset my dies according to the instructions. Same result. Used my Lee load data book and the closest comparable data I could find was 142 jacketed over 38.8gr of H4350 and they listed a minimum OAL of 2.780”. I lowered my seating stem and to 2.78 and it chambered correctly. This seemed to make sense because i thought I could see marks on my longer cartridges like they were hitting the rifling. But that confused me because saami lists max COL at 2.825”. Lol. Can someone explain COL/OAL? How much wiggle room is there? Why does it seem that the chamber is shorter than saami spec?