Mine is up to .049". Multiple folks have told me my cases should rupturing on a somewhat regular basis, but the gun still shoots. I placed 15th 3p at Perry last summer and had a 20X at 100 yards last May to go with a number of other 20x targets at 50 yards.
I was wondering if anyone had any theories on how the gun is still managing to shoot.
Excessive head space
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SAAMI Headspace
The SAAMI maximum is 0.051, so the reason your rifle still works is it's within spec:-)