For case lube I use Grease Auto and Artillery GAA or Grease Aircraft Wide Temp Range WTR. You can find it at surplus stores, ebay etc.
If you have a friend who is aircraft mechanic type ask him for Aeroshell 33 (same as WTR above)
It is synthetic and a light tan color.
You might also try Mobil 1 synthetic chassis grease which is pink, got mine at Autozone.
Next what is dimension of your fired cases measured .200" up from case rim?
Normally this should be .471- .473 though I have seen fired cases measure .475".
New unfired brass should measure .465 at same place. Not all dies size the same as I have dies that size from .466 to .469.
Check internal die surface for corrosion as well.
Do fired cases show bulge in one direction more than other?
I have loaded Greek 303 brass but not their 30.06 yet but I do know we gave them a 30.06 line out of Frankford Arsenal when it closed.
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