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Per Hornady's reloading text Hornady performs their all ballistic work with SAAMI guidelines at 70 degrees F.All powders generally develop higher pressures at higher ambient temperatures.Personally, I would be very concerned taking a max safe 416 Rem load at 62,000 psi at 70 degrees F and hunting it at 110-120 degrees F for dangerous game in Africa.

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Ay, there's the rub! Maybe this discussion is really one coming out in favor of reintroducing "tropical" loads. Were I a member of the Barnes or Hornady family, if only for liability purposes, I think I might consider publishing at least two sets of data for all DG calibres based upon different temperature ranges. Alas, it is likely the case that ammo companies and those publishing reloading data assume 99% of all .416, .458 or .505 ammo will never be fired at an animal much less one in Africa. Even so, I still never hear about .300 Win ammo blowing up guns in Texas heat. Hot is hot....Sadly, I can tell you right now that a Cairo July at 107 is no hotter than a Utah August at the same temp.

hoppdoc,

AH HA! You found a very good excuse to own BOTH a .416 Rem and a .416 Rigby! In fact, you may have convinced me of the pressure issue! Now I can throw that model 70 in a synthetic stock for Canada while "investing" in a nice Walnut stocked Hein .416 Rigby for Africa!

Best Regards,

John

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