Bullet Seating Depth (6.5x284 Norma)

[Wachsmann]

Can a gun respond to various bullet seating depths when powder is changed and velocity. I have one load that uses Hybrid 100v at 2845fps and shoots right at 1/2 MOA. Yesterday I was doing some load work up with retumbo trying to increase my overall velocity. I chose to go with 57grns and start a seating depth test. MY best group looks t be about .040 off the lands. MY hybrid group was about .070 off the lands. All bullets are brger 140 vld's.

 

[FearNoWind]

Every change in your load (type of powder, seating depth, primer selection) will affect how the bullet prints on target. It is possible to run a range of seating depths leaving all other factors constant and still find a node at more than one place with the testing range.
My rule of thumb for reloading is that there are no constants. Even a an identical load in two rifles within exactly the same action, stock, chamber, bore, barrel length will perform differently.