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OK, got a ball micrometer and measured three pieces of brass in four places. Averaged each one of those and then took over all average of the three total averages which was .017075, doubled it = 0.03415 + 0.284= 0.31815. So I am going to order a 0.316 bushing.

But how do I load up a round without the bushing for the die? I don't want to order 5 bushings, that ain't cheap.

I don't understand something. The book shows .320 outer measurement but everybody who has responded is talking about .304, .305, etc. Why is there so much difference from the book? I even emailed Nosler and they suggested a bushing of .316 for .002 of neck tension.

Finally got Nosler brass, boy they are big!!!! Anyhow.... they are pretty consistently .018 with a caliper. I don't have a ball micrometer. I will use this rifle for hunting but it's a nice very capable rifle and I have to reload so I want to do it justice with my reloading. That said, I can...

Yeah, would love to but no components yet. They are all in the mail and after I get them I can't load them without a bushing. I knew this caliber would be tough due to scarcity but not this tough.

Just got my M21 this week and ordering all components to load the ammo as it can't be bought anywhere. I wanted to try the Redding dies as liked the idea of bushings but then realized it doesn't come with bushings. I have no ammo or cases to measure so I was wondering if anyone here can help...