fxdwg28 wrote:i think?
can i have shallower lands.....to gain more .bore pressure ....and drive?..
Hmmm...not really as there is a finite limit on how much pressure your brass and your rifle can handle, both short-term and long-term.
You can seat the bullet deep into the case, but it takes up volume which means you have less powder.
I don't worry about the lands if I don't have to, just load the cartridge as long as I can without jamming into the lands (measure the CoAL to the lands then round it to a convenient number about .010-020" less), or having to single-load, and play with the powder charge to find the most accurate. If it's really not shooting well it might indicate a bullet that is "jump fussy", which gets annoying. I would prefer to switch to a better bullet in that case, but you can play with the seating depth and see if it improves.
I have zero interest in even loading to factory pressures in any of my rifles, seating the bullets long lets me get to factory velocities with lower pressures (with less wear on my brass and my rifle), or get higher-than-factory velocities without reaching pressure signs.
You mentioned at the start that you are working on a load for your "long range rifle" - what ranges are you looking at shooting - 500m, 1000m, 2000m, more?