We are going to have an unusually warm weekend in North Texas. Expected temps will be between 100-104 F.
I am going to take my 416 Rem (Mod 70) 400 gr loaded at 2450 FPS and my 458 Win Mag (Browning Safari) 500 gr loaded at 2170 FPS and run about 7 - 8 rounds through each in the heat of the day in a rather fast succession.
I sort of doubt it gets much hotter in Africa during their winter when most of the hunting is done.
I will let you guys know if I experience any sticky actions. I am running RL-15 through the 416 and 2230 through the 458

EZ

Thanks, it will be great info!

Regards,

Chuck

Unless you are going to leave the rifle with a round chambered (or the rounds themselves) exposed to direct sunlight, I don't think you will see any difference in pressures.

George

George,

That is the plan. I will put 3-4 rounds in each gun and leave them in the sun for an hour or so.
I suspect that will be a worse case scenario.

Try leaving a few rounds in an Ammo Belt with the top half of the round exposed
and then chamber them.

I shoot in those temps and have had ammo which has been on my belt damn hot
to the touch.

Never had any problems with pressure even though it was more than 105F
but the ADI powder is very insensitive to heat variations (it has to be
over here as it is so often over 105F).

I can assure all that the metal on these guns will far exceed the ambient temperature in direct sunlight. I am going to conduct this little test at my farm. Just working out there and leaving tools on the tailgate of the truck in 100 degree heat will become too hot to handle. I suspect in excess of 130 F.

quote:

Originally posted by eezridr:
I can assure all that the metal on these guns will far exceed the ambient temperature in direct sunlight. I am going to conduct this little test at my farm. Just working out there and leaving tools on the tailgate of the truck in 100 degree heat will become too hot to handle. I suspect in excess of 130 F.

Agreed.

More than 130 F.

They are too hot to handle some times
and I have to cover them up and let them
cool down to be able to load.

You might see some pressure variations only if your loaded near max and the powder burn rate is highly temperature sensitive. Thats a bad combination! Otherwise it will work just fine.-Rob

quote:

Originally posted by Robgunbuilder:
You might see some pressure variations only if your loaded near max and the powder burn rate is highly temperature sensitive. Thats a bad combination! Otherwise it will work just fine.-Rob

That's the good thing about the ADI Powders (which are made here but sold in the US under another name).

They are NOT temperature sensitive which is great, especially since it cold affect DR regulation and I load in a colder environment and hunt in a very hot environment.

quote:

Originally posted by 500N:

quote:

Originally posted by Robgunbuilder:
You might see some pressure variations only if your loaded near max and the powder burn rate is highly temperature sensitive. Thats a bad combination! Otherwise it will work just fine.-Rob

That's the good thing about the ADI Powders (which are made here but sold in the US under another name).

They are NOT temperature sensitive which is great, especially since it cold affect DR regulation and I load in a colder environment and hunt in a very hot environment.

ADI powders are sold under the Hogdon Extreme label. I have done the "set out in the heat on a 100* plus day" test and they showed no variation I could discern amongst the typical round to round deviation.

I have also tried it with 458wm loads with AA2230 and though I might have noticed a very slight pick up in velocity, but it might have just been load to load variation. Certainly not a factor worth considering so long as your loads aren't right up at or beyond book max.

My 458wm loads with AA2230 produce 2145fps corrected to the muzzle with 500gr Woodleighs.

BTW, I got 100's of fps variation with IMR 3031 because of temps. Wouldn't wish that powder on my worst enemy for a DG rifle.

JPK