Jason Baney gives a good description of his method of determining an accurate load over on Accurate Shooter.com using what he refers to as 'Round Robin' (Ladder Testing) shooting as per various selected trial loads he makes up. My method is a little different...but it works also. Rather than shooting several loads all at one shooting session as Jason does...I elect to basically do the same thing...as far as shooting several loads which have developed within a 'window' but I elect to do my testing over a period of days whereby I shoot early morning when mirage is virtually nil and with no wind. I'm blessed with owning my own range back to 1500 yards so it's no difficult thing for me to shoot when the conditions are favorable. I've been shooting early the past 5 days and confirmation was made this morning on my final load for my 6.5x47Lapua. I fire two sighters on a spare target frame before I change over to another target for the 5 test rounds. The photo below shows the 5 rounds fired this AM. The shot toward 12 o/clock within the 10 ring sized plate was the first shot and I came down 1/4 MOA and fired the remaining 4 rounds which impacted as seen. Total vertical for these 4 rounds is 1.250". My final load is 38.3 grs. Varget, BR4 primer, 123 gr. Sierra HPBT w/Meplat closed, Lapua cases and bullet seated .375" into the case. COAL=2.742". Bullet into lands .010". Barrel is Kreiger 1-8.5 ROT.