Ramshot lists 2.260, Accurate list 2.260, Nosler recommends you find the lands and seat .015 to .030 off with at least one bullet diameter seated into the case.
Nosler #6 page 43.
Start long and work the load up, then reduce OAL to find sweet spot, remember, seating deeper will reduce pressures as the closer to the lands the higher the pressure.
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