O k my explaination is a little late here .I once shot a batch of aquired ammo in this case LC42 was the head stamp 30-06'
I would get over a bench or sitting and 2 or 3 would cluster into around 4" then 2-3 would go low and right or straight down or high left always about 9" in my frustration I faulted the gun myself etc . Finally after about 40 rounds of this nonsense I decided to just empty the brass and build a load that would work in this rifle . So I practiced form breathing trigger control untill I had burned up the remaining 80 rounds . The ultimat result? 3 groups of 4"about 4" apart . Cases that varied 1.5 grains of water capacitycaused the impact shift . I had shot4 bullet weights 150,165,175,180from Win Fed Rem totaling 11 boxes groups were from bad to not even on the paper . My load barely off the minimum gives me around 2600 fps with a 150 spbt and 5 under a silver dollar if I reduce the load just .3 grn I can cover 3 with a dime 5 with a nickle . Of course I did match those cases volume andtrim those 40 are all but used up now So I must start all over .