Thread: 7saum same load different speeds

Hey everyone, recently bought a 7saum that is well known on the forum, copied same load exactly, 168 bergers, 63.6gr rl26, ADG brass, 210 primers and same seating depth. That load was doing 2900fps in 20” barrel but the loads I have done I was getting an average of 2810 fps.

What would cause such a big difference in speed when using the same load as the rifle was already shooting?

Cheers