Does any one know other than stats what is the diff between these. I pulled a 6.5-06 barrel that I got tired of and am seriously thinking of shorten the chamber end and put it on a carcano and chamber it to carcano chamber. With a true bore that cartridge must shooting with more authority than the books advocate, and that brings me back to the grendle. People cheer the grendle and snob the 6.5 carcano and I believe in a correct bore and tight spec chamber that cartridge will do better. I get the ar reason for the grendle but I am talking of a bolt, single shot or other application.