European Load data for 8MM Mauser

My pet load uses the 180 Nosler Ballistic Tip over VVN !50 powder.
In fact the load itself is so accurate I have to ask...... how does one measure a one-hole group ??
 
My pet load uses the 180 Nosler Ballistic Tip over VVN !50 powder.
In fact the load itself is so accurate I have to ask...... how does one measure a one-hole group ??

CGN standard is to measure the widest part to the nearest .01", subtract the calibre, and then divide by 3.
 
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