06-18-2011, 09:01 PM
Harrison might have told me that he has done them for custom requests, so I imagine he could use his 6BR bolt/extension combo and just machine the bolt face for a .444" cartridge versus the .473" one. The bolt face depth and extractor notch location also have to be worked out, but I just wish he would offer a production run of these for Grendels. The 6.5BR takes up a ton of magazine capacity, although it does hold a lot more powder. He claims an average of over 150 fps over the Grendel with the 6.5BR.
