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Yes there is a lot of stuff on there that goes ito real minute detail. One guy mentions what the US Navy and the manufacturers say, which is the powder is dried to a known moisture content and then sealed up in its containers, any change from that affects the burning rate ( which changes your load characteristics) and not always how you would expect.
Primers are a tad better in that they get a coat of varnish when made but can still change their characteristics.
Military ammo is sealed both at primer and bullet to make it more durable and consistent too.
As I said in bigger rounds I haven't noticed any major differences , but in the small stuff where a tenth or two makes a real difference I have noticed changes in point of impact that were enough to get me thinking, what made the difference.
Since I tightened up on my storage things have gotten better and I can pretty well guarantee my small rounds will do the same each time now.
I surely dont worry about the kind of day I go shooting and carrying a weather station round with me though.
P.S try Altavista.com ,I find it is sometimes a better search engine than Google.
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