Actually you measure the size of the hole and subtract the bullet diameter, e.g. if the hole measures .408 and you are shooting and you are shooting a 308 caliber rifle your group size would be .100 (.408{hole}-.308{caliber}=.100{group size}).
My smallest 5 shot group to date is .172 shot with a 308 win at 100 meters. The actual "hole" was .480.
Hope this helps.
Jim
[ 04-17-2002: Message edited by: 338Lapua ]
My smallest 5 shot group to date is .172 shot with a 308 win at 100 meters. The actual "hole" was .480.
Hope this helps.
Jim
[ 04-17-2002: Message edited by: 338Lapua ]