I am just starting on my second firing of my 6br brass and things seem different on the neck tension side than the first firing.
For the first firing, I mandreled with a 0.2435" mandrel then chamfered/deburred. After spring back, I measured the neck OD at 0.268". I then seated with a K&M arbor press w the force pack and got a reading of ~0.005". Seated OD of my necks was 0.269", so 0.001" of neck tension. The gun shot great for all 800 rds.
For the second firing, I tumbled in rice, annealed using a Aztec code on Amp, sized w a Harrell's die using a 0.266" bushing, mandreled with a 0.243" (0.2435 seemed a bit to much this time), trimmed/chamfered, and started to seat. I am reading like 0.012-0.015" on my force gauge now (like 3x), but I still have about 0.001" of neck tension.
Any idea what could be going on? I mean, the neck OD still says I have 0.001" of tension but why would it take so much more pressure to seat. It physically feels like more with the Arbor press.
For the first firing, I mandreled with a 0.2435" mandrel then chamfered/deburred. After spring back, I measured the neck OD at 0.268". I then seated with a K&M arbor press w the force pack and got a reading of ~0.005". Seated OD of my necks was 0.269", so 0.001" of neck tension. The gun shot great for all 800 rds.
For the second firing, I tumbled in rice, annealed using a Aztec code on Amp, sized w a Harrell's die using a 0.266" bushing, mandreled with a 0.243" (0.2435 seemed a bit to much this time), trimmed/chamfered, and started to seat. I am reading like 0.012-0.015" on my force gauge now (like 3x), but I still have about 0.001" of neck tension.
Any idea what could be going on? I mean, the neck OD still says I have 0.001" of tension but why would it take so much more pressure to seat. It physically feels like more with the Arbor press.