Ive often wondered the same thing. 15 or so yrs ago I optted to stop trying to get "every" rd exactly and precisely the same as far as bullet depth. I rather pay more attention to same neck tension (same brand) same lot# of propellant (with exact powder chargs) and same lot# primers.... Ive given up on plaiyng with seating depths just as long ago as well (to me....I found no proven advantages)
getting down to the natts ass of trying to do what your doing will IMHO...drive you crazy
im loading to std aol, and hitting steels from 100 out to 1K....to me?...reading and adjusting to wind when sending them out to distance is far harder to achieve than worrying about such small variences in depth.
Reloading is so subjective....what works for some doesnt work for others and i can respect that...just dont let it drive your crazy.
If your getting 1/4" to 1/2" patterns at 100 (consistantly)..then I gaurantee your ready for distance (providing you have ballistics calculated)
Good luck....if you do happen to find some kind of info as to your depth issues, let us know. Im curious as to what the culprit is.
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