What do you consider an accurate load?

[killshot44]

If you're having OAL and runout changes after chambering there's a problem with your neck tension.
The VLDs pretty much have to be seated at or into the lands. All my long-line loads are jammed. Slow Fire
strings are mandatory single loaded anyway.

[PoofNoEyebrows]

Why not just simply start by eliminating yourself out of the equation. Lock the rifle down in a sled so all your really doing is pulling the trigger. See how it does, and start adjusting some load recipes till you find that magic combination. I agree that you will probably get more accurate results by setting your OAL as long as possible to get a more consistent chambering. I generally shoot for as long as possible while still being able to cycle the rifle reliably.