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run this load for me and tell me my SD and perhaps calculated pressure is?
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Unless you shoot the load in your gun, the standard deviation you would get is just a "guesstimate". There are too many unknown variables like how tight your cylinders are, how much crimp was applied, exact seating depth, how small the brass was sized, how much neck tension on the bullet (how springy the brass- new or older brass).
The only way to get the real SD is to fire the rounds in your gun and chronograph each shot.