Tried a search but no show, anyone used 100 grain TSX in .2506?

They are fantastic. I load them for my father-in-law. Ruger #1B. Very accurate and perfect on game performance.

yes, got my 25 year old rem 700 to shoot really good with them, less than 1/2 inch

How far off the lands do you start load development? Do you use a Sinclair Comparator or similar tool for this measurement?