Quote:
from 5.0 to 6.4 for a 165 bullet.
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As if I was in this situation, I followed Sunday Shooter's advice and looked up Hodgdon's data.
Heh, Hodgdon starts even lower at 4.5 grains
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I don't load 40 S&W; but I do load 10mm Auto with X-treme's 180gn bullets for my range shooters. Kind of apples n oranges, I know.
TiteGroup is pretty spunky stuff. In this case, I'd be inclined to stick with Hodgdon's data by starting at 4.5-ish and working up as needed. TG is highly energetic and unforgiving. This would be a good time to err on the side of caution.
BTW, you never told us your load purpose. Considering you've got a plated bullet, I'm assuming you want to make some good consistent range ammo (??).