I have a Grendel, built by Bill Alexander.
Have had it for just under a year and a half.
It is a tack driver.
That's the
good news.
The
bad news is that the whole concept behind the Grendel was to design a cartridge that absolutely maximized a balance of internal ballistics (max speed/weight), external ballistics (max ballistic coefficient for retaining that speed), terminal ballistics (enough energy at distance to kill at ~800 yards) and match-grade accuracy...
*** within the constrictions of an ordinary AR15 action ***
Were you looking at a gas gun, it would be a no-brainer (price would be another subject). But the Grendel in a bolt action is a specialized/less-than-full-potential 6.5mm bullet thrower. A Swedish 6.5x55 would be a better-if-not-ideal bet.
For what you've said you want it for, I'd recommend you take a pass on that particular Grendel