All standard chamberings have internationally honored standard specifications on dimensions and operating pressures that manufacturers adhere to. Overall loaded cartridge length is one of the specifications that fall within that standard. When a heavier (longer) bullet is loaded in a given cartridge, the extra length will result in deeper seating of the bullet and NOT greater overall cartridge length. This also reduces the available capacity for powder. The need to balance pressure, velocity, external dimensions and accuracy will dictate an upper limit on bullet weight for a cartridge.CM2k said:Didn't the SS109 round have a longer, heavier bullet over the M193? Might that be an issue in terms of chambering a round?
From http://www.saami.orgmrotherstuff said:I've been hearing that the 5.56x45mm and the .223 Rem cartridges are not exactly the same.
7.62 vs. .308 doesn't seem to have the same problem according to SAAMI.talking_target said:So what SAAMI said for the 5.56 vs. .223 also apply to 7.62 vs. .308?