Initially it would be easier to use the 243, because you can get by using the .473 bolt face, but you can't use the 223 bolt face with the Grendel. I bought the 7.62x39 bolt face for my Grendel build, but I haven't swapped it out yet. Maybe in May? Eather rifle would be suitable for the build, just depends which one you want to keep the same. :-)
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