FWIW, I took it to the range Friday and ran a box of cheap factory loads through it to sight it in and break the barrel in. The extractor worked fine on empty cases and the feeding problem seems to have disappeared. Hmmmm...
I fired a few groups and it looks like it may turn out to be a shooter. Three groups with 139 gr Hornady factory loads ranged from 3/4" to 1-1/4". We'll see what happens when I cook up some handloads and settle in to really shoot.
Fingers crossed.
