I am working up a 90 gr 9mm bullet and was stumped by something. It is a Hornady 90 gr xtp and according to Hornady the max charge is 7.2 with hs6 at 1250 fps. Sierra has a listing for a 90 gr bullet at a max of 8.2 gr of hs6 at 1400 fps. Whats strange is the most of the other powders match pretty well with charges and velocity between the two manuals but Sierra pushes about another 150 fps for a 90 gr bullet. Is it fair to say I can work up to close to the 8.2 gr with the Hornady bullet? What sorts of pressure signs should I be looking for?
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