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I'm using a "300 Fireball" barrel from Model 1 Sales with the gas port in the carbine position. I use 223's cut down with a sanding disk on my old ShopSmith. I then reform them to make cases with a Redding die set. I use a neck reaming bit in my old Pacific trimmer with a Forster inside neck reamer to ream the inside of the necks and trim the length of the cases at the same time. Takes me about 2 hours to make 100 cases. The inside neck reaming is probably not necessary, but doesn't cost me any time since I trim and ream at the same time.
I haven't had any major problems with subsonic or supersonic loads. As long as the bullets are heavy (210+) it shoots subsonic. The lighter bullets (125, 150, 175's) perform well as supersonic loads. I guess the extra pressure that builds behind the heavy bullets seems to work the action well.
I'm using a cheap collapsable stock and carbine buffer that I got from Cheaper Than Dirt, a Model 1 Sales barrel and gas block, a DPMS slick-side high-rise upper. I'm shooting 1/2" groups with cheap surplus 147gr FMJ's at 100 yards running about 2300fps. I've run cast lead 200 grain RCBS bullets and gotten 2" groups running about 800fps. Sierra 220's run about 750fps with the same results.
Total cost of whole firearm = $700 not counting the scope!
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