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Bear in mind that primer appearance and extraction are NOT reliable overpressure signs.
If you persist in increasing the load......as soon as you get either less or more velocity than forcast based on your chrono data from the work-up loads.....back it down. Even if primers and extraction are still normal.
If you are not getting increased accuracy by loading up....back it down now to your most accurate load.
The tighter (better) the headspace.....the higher the pressure required to show primer signs. Same goes for the shape of the firing pin nose, clearance between firing pin an bolt etc etc.
If you are really unlucky, might not show pressure signs till you get into the 70,000 range.
Have fun, but don't juggle hand gernades.
And....remember that when you are loading to the edge....an increase in ambient or ammo temp over your test conditions can put you over.
Sam
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