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Old September 21, 2006, 04:25 PM   #7
amamnn
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Join Date: May 13, 2006
Location: WA, the left armpit of the USA
Posts: 1,323
I can't agree that your doing everything right and in the safety margins if you've been accurate with the details in your post. Where did you get that load data??????????
I'd go with Sierra or any bullet maker's data over general info from the powder people. It's entirely possible that going so far out to the lands, you've got insufficient neck tension. Better to begin at the Sierra recommended COL and change that ONLY after dialing in the rest of the load.
The powder charges you've listed for 180 gr. Sierra MKs using Varget powder are far above the recommended load data in the Sierra manual. The MAX load for varget acording to the 5th edition Sierra loading manual page 540 is 41.7 grains!!!!!!!!!!!!!

This would explain both your problems and will explain your future throat erosion and copper fouling problems.
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