Work in progress
This is timely for me. I just rebarreled my Cooper 21 to 20 Vartarg I purchased 250 rounds of new 5.56 brass from Everglades ammo. Looks amazing. I picked up a fireball form die and ran all brass without a problem. I purchased a trim die from Ebay to use with my Harbor Freight mini chop saw. When adjusted the cases are perfect. I've run them thru my Mach Iv form die and now I need to either turn or ream the necks as I'm about 8 thousands thick at his point. Is there a possibility of a donut that might benefit from reaming the necks? Everything looks so good to this point, I don't want to screw it up. I'd highly recommend the case trimmer for an easy perfect trim.
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