Originally Posted by T3-OleMan
Also, if you change any item in your load CLEAN the barrel. Most important is the bullets. The composition of the jackets and or solid Barnes & GMXs will be different and you will not get the truth. Don't think brass change would require a cleaning but don't mix types and or shot counts!
Finally, don't change but ONE thing at a time.
get the pipe clean.... if you change bullet brands you probably want to get the copper foul out from one brand before playing with the next one. Especially if you are having trouble later in your test group runs.