You-Two
Member
I bought the Hornady headspace measuring tool with the intent of sizing my rifle cartridges to the specific chambers. My first try has led to some questions...mainly concerning the measurements I took compared to the SAAMI specs. The rifle is a new Marlin XL-7 in .30-06 and the brass is once fired Rem (from that gun). I zero'ed the caliper at 2.0" with the tool installed and double checked I was using the correct diameter gauge.
SAAMI spec for .30-06 is: 2.0487-2.0587
My average reading for 30 cartridges was: 2.043 (lowest was 2.042 & highest 2.044). The average for the remaining unfired Rem I have was 2.040.
I also tried the RCBS Precision Mic and it averaged -.001.
Does this mean I have an undersized chamber? Or am I doing something wrong? Also, I did the same thing with three rifles in .223 (2 x ARs and 1 x Savage 12fcv) with the same type of results. All the measurements averaged below the min specified by SAAMI.
Any insight would be appreciated!
Thanks...
SAAMI spec for .30-06 is: 2.0487-2.0587
My average reading for 30 cartridges was: 2.043 (lowest was 2.042 & highest 2.044). The average for the remaining unfired Rem I have was 2.040.
I also tried the RCBS Precision Mic and it averaged -.001.
Does this mean I have an undersized chamber? Or am I doing something wrong? Also, I did the same thing with three rifles in .223 (2 x ARs and 1 x Savage 12fcv) with the same type of results. All the measurements averaged below the min specified by SAAMI.
Any insight would be appreciated!
Thanks...