Any short cut tips on bullet seating depth

[zx10mike]

If you're finding optimal weight and length with 3 shot groups what is there left to fine tune with a 5 shot group?

well once your are close you will be down to the .2 of a grain powder and 1 tho seat depth change.not sue you would want to do that on every charge and seat over a wide margin.

[Parabuteo]

Nodes are based on more than OAL. It is to do with the points at which the barrel vibrates at the highest freq (so lowest amplitude). Node will depend on all sorts, barrel thickness, length, materal, charge, hold etc etc.

This is why people shoot a ladder test/load test, then fine tune with the OAL.