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Sounds too good to be true:)

From my experience, it doesn't take long too get used to it (assuming you are left eye dominant) and then you will wonder why you didn't do it sooner.

Fair comment Tahr but i don't know if 300fps is "measly". Roughly the difference between a 7mm08 and 7WSM? or a 308 and a 300WSM? If it is economy you want then it would defiantly be a better option...

Ok. Sorry. Didn't mean to offend. I obviously couldn't recognise which bits were the piss take.
Nothing against the Grendel, but if it were me (which it isn't) and I was wanting a 'deer' cartridge...

Interesting you say that "every donkey will be head shot", but you also say your shooting will range from "50-600m"?
I think there are more important things to sort than which trendy 6.5 cartridge...

Get a left handed one and you will wonder why you didn't do it sooner.