Hey mate, you miss understand what I said.. I'm comparing 6mm offerings (6mm ARC 6ppc 6x45 etc) in the limited mag length howa mini rifle that these chassis are designed for... apple's and oranges comparing a 6mm Creedmore to a 12.5" 6.5 Grandel.
The 12.5 grendel gets just under 2300fps with BM8208.
To state the obvious at this point, a 12.5" 6mm ARC shooting 108s doesnt come close to a 6.5 Grendel shooting 123gr.
There is a cross over point where most of the howa mini chamberings alighn, some flatter shooting and some harder hitting but I am a speaking from a longer range carried energy point of view. Maybe I should have made that more transparent. I have also had better luck with the 6.5 match bullets over the 6mm match bullets when it comes to 100% energy dump on animals with no pass through. So although the custom loaded 12.5" 6mm a has a little more muzzle velocity (2360fps) than the 6.5mm (2290fps) it doesn't kill as well as the grendel in my experience.
As you well know I do enjoy a longer shot so this is how I tend to trade these things off against each other but either cartridge is as good as a full length .223rem at more moderate hunting ranges.
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