I understand that and I am not a great fan of 5.56 BUT the point was standardisation, regardless of the caliber.
My take is that powders and projectiles have improved over the years. This has improved many existing cartridges. My understanding is that 6.5 CM is an attempt to make the best use of all of these in a short action rifle. Seems to have worked but only those who shoot long range out of a short action rifle are likely to notice/care. IE a military sniper or designated marksman etc For bush hunting deer you probably wont notice the difference between 6.5 x55, 260 or even 6.5-06
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