I never considered necking down when I built my 6 x 45 recently, that 20 Practical really has my interest now . I had a 20 Tac at one time and enjoyed it , looks like I need to revisit the 20 caliber . Thanks for posting the article ..20 Practical
You can use your existing brass (and maybe even the sizing die with a new bushing). It will mag-feed fine as it is basically a 20-223 Rem.
Whitley has figured this out. Great P-Dog round and very accurate (might just shoot better than it does in .223 Rem)
Link: http://bulletin.accurateshooter.com/2019/01/the-20-practical-ar-wicked-accuracy-low-recoil/
And these 100-yard groups are with three differerent .20 Practical AR uppers. Not bad for semi-autos...
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