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Old May 13, 2013, 08:57 PM   #12
Jim Watson
Senior Member
Join Date: October 25, 2001
Location: Alabama
Posts: 14,104
The 721 is a strong action and it would take a lot of abuse to set the headspace back to a dangerous degree.
I suspect the ammo more than the gun.
It might be corrosion, age hardening, work hardening, or the shoulder set back too far in the sizing die.
Show pictures of the failed brass.
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