well i do think you do not know how army is choosing tools ... CR they did not choose the caliber nor the rifle .... the army did ....
Very brief and simplified version as the full version would take days to explain.
In this case it starts with an SOCD, stating that current equipment (Lee Enfield) is no longer able to adequately meet operational requirements. This is then reviewed by multiple offices to determine validity. If determined to be valid the file will eventually make its way to Directorate Land Requirements (DLR), where in conjunction with the user community build a Statement of Requirement (SOR) for the replacement. The SOR lists both the fixed and variable performance levels that must be attained. After the SOR is finalized, development of a Request for Proposals (RFP) begins, and when finalized the RFP is released by Procurement Canada to industry. Then the back-forth ten-way #### show begins.
Had some characteristic of the .308 not been acceptable to the CR’s, the cartridge would have been excluded by the SOR. The big army doesn’t care what the CR’s use in much the same way they don’t care what CANSOFCOM uses. The “common ammo” myth is just that, a myth. Find me another group in the Army being issued Nosler Accubonds.
As I said before, I’m not saying going bigger is right or wrong. Shoot what you’re comfortable and accurate with. But don’t be fooled into thinking you ‘need’ anything more than a .308/30-06/.270/etc.