I am getting a barrel built for a long range bench rest rife. I plan to use a “heavy for the caliber” bullet a Berger VLD, so I will be single loading and I am not concerned with cartridge overall length. My question is while I have the chance to move the throat I’m wondering if I should and how to determine how much.

I have made some dummy rounds putting the junction of the boat tail at the junction of the case shoulder to case neck. Since this is a new round for me and there is not a lot of data out there for it, how do I determine how far out to put the lands? Should tell the barrel manufacture dummy round plus .020 thousands of an inch and call it a day? Thanks for any help.