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By the way bottom up means the lowest powder charge first and then shoot them and come back and reload the next with same powder one or two grains heavyer and try them and so on and so fourth untill you get to the maximum for that particuler load.
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Not trying to nit-pick, but not all guns will handle published maximum loads. I believe the idea is to work up from minimum, watching for pressure signs
and then quit at that point if you see any.
1. You may or may not find a "sweet spot" before that occurs.
2. There are no reliable signs of overpressure.
You are correct in advising that SAAMI pressure limits shouldn't be exceeded, but that
can occur before published maximums are reached.