Retaks... regarding a setting of "around 4", not sure what you are looking at... here's a C&P from the table you linked... for my caliber.
300 WSM
150gr. BST
Winchester
1
0.5
300 WSM
180gr. PP
Winchester
1
1
300 WSM
180gr. FS
Winchester
3
10
The first number is for an A-Bolt and the second number is for a BAR.
If I follow your previous recommendation that the 180 gr. XP3s are similar to the 150 gr. BSTs, I should start at a setting of 1.0, correct?
TIA, cd.