Barnes info: In our lab, we have experienced best pressures and accuracy when TSX Bullets are seated .030″ .070″ off the lands (the grooves or rifling in a barrel.) The majority of the time, weve seen optimum accuracy when bullets are seated .050″ off the lands, so start there.
Use big jumps to determine a wide band that has a sweet spot in there somewhere and then use smaller jumps but still larger than .003 to fine tune the spot. Finally get down to .003 intervals IF you even think it is necessary.
If you are using a hunting gun and getting .5 MOA at .080 off and .4 MOA at .120 off , "is it really worth the time, effort and expense to try to get that extra .1 MOA?"
If so split it at .100 and see how it shoots, that will tell you which way to go.
.003 intervals sounds nice and really cool as that is common in min SAAMI tight neck BR chambers for 1K guns, but in factory chambers you are wasting your time and barrel life. Particularily if you are basing you assessment on one 3 shot group.