I really like the Grendel. But, when I went for my Savage build, I built a 260 Remington. I can use the same bullets as my Grendels, but I have a cartridge that is a lot more capable.

If you want to build the Grendel, the components look good. I would think a 308 style follower would work better, but you will have unused space at the back of the magazine. You will need to do some tweaking unless there is a PPC follower of some kind.