Re: ar-15 caliber
The 6.5 Grendel seems like the logical choice, with factory ammo and all. The dtec is very similar to the 22 PDK. I got mine from White Oak Armarmet a few years ago and love it. It's 6.8 necked down and improved and will get 3700+ with a 50gr and 3500+ with a 68gr bthp in a 20 inch upper. It's very accurate and anchors coyotes with athuority. I use a 2.5-10 IOR scope, on low for calling and turn it up and dial in for the long ones. It is a very fun rig.