02-11-2020, 02:05 PM
I did lap the upper before assembly.
For the Gold Dot load I was using Power Pro Varmint. Started at 25.6 gr and worked up. Had a split case at 25.8 gr. Split in the body of the case, but after looking closely, determined that the split was where there was a gouge in the case from an earlier loading, I believe caused by a magazine feed issue. At 26.4 gr is where the extractor issues started. Fired a couple that did not extract completely, the third did not extract at all. That is when I stopped.
I did not measure the gas port before assembly. Rifle has an H buffer (3.8 oz). Not sure on the spring, probably standard carbine spring.
Rifle had been shooting well before this issue came up.
For the Gold Dot load I was using Power Pro Varmint. Started at 25.6 gr and worked up. Had a split case at 25.8 gr. Split in the body of the case, but after looking closely, determined that the split was where there was a gouge in the case from an earlier loading, I believe caused by a magazine feed issue. At 26.4 gr is where the extractor issues started. Fired a couple that did not extract completely, the third did not extract at all. That is when I stopped.
I did not measure the gas port before assembly. Rifle has an H buffer (3.8 oz). Not sure on the spring, probably standard carbine spring.
Rifle had been shooting well before this issue came up.