Already got me 100 pcs of ADG 7 mag. Thanks for the info thoughHey JJMOODY look into some winchester brass first buddy off the top of my head most of mine measure .306" so you may not need to take off as much and honestly it will run with any of the new hotness just needs a little more work.. i always shoot for at minimum .004" clearence but like .0055" better .. all my
7mags have liked .001" neck tension
magman caught the 28 caliber.308 neck chamber as mentioned 7 mag
With cartridges re-formed I anneal as needed during new brass preps.
What is your theory on why this is?
Thought maybe you noticed some correlations?
Not much theory, just experience. I Have experienced pressure when shooting cases that had thick necks and were not free to expand when fired because of the neck chamber. After turning (Reducing neck wall) pressure went away. I have also found that the large capacity wildcats are very sensitive to neck clearance and work best with .004 thousandths.
When necks are turned or clearance is .004 on new cases, Pressure is not a problem. Reduced loads help control pressures, but with the trend of shooting max loads this clearance and freebore will solve this pressure problem. Anything that restrains the bullet takes energy and that equates to more pressure.
This is not a personal like, it is a fact when shooting big powerful cartridges fast while maintaining reasonable (SAMMI) pressures. Smaller diameter projectiles are less effected but still need at least .003 clearance to optimize the velocity and pressure.
Seating bullets to the lands has it's place, but for velocity without excessive pressure you need freebore and neck clearance.
J E CUSTOM
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