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Forum Index > Rifles general discussion > What's the best powder for a 7 mag in -30 to 30 degrees

What's the best powder for a 7 mag in -30 to 30 degrees

10 Aug 2016
@ 01:40 am (GMT)

Bob Wiggins

My Rifle is shooting really well with RL25 in 70-80 degree weather. But I plan to do some hunting in really cold climates this fall(-25 to 35 degrees). what other powders should I try in my rifle? RL26 and H1000 is on my short list. What else should I try?

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10 Aug 2016
@ 03:58 am (GMT)

Thomas Kitchen

Re: What's the best powder for a 7 mag in -30 to 30 degrees
hi Bob
have you got bit more info for us.
7mm rem mag?
projectiles? weight etc.
barrel length?
cheers
10 Aug 2016
@ 08:37 am (GMT)

Warwick Marflitt

Re: What's the best powder for a 7 mag in -30 to 30 degrees
Hey Bob degrees Celsius or Fahrenheit the differences are quite large
As zero degrees at one is 32 degrees in the other and Fahrenheit is more accurate than Celsius due to there being a finer scale ( more degrees) in Fahrenheit than in Celsius from frozen water to boiling.

Frozen [email protected] 0 deg Celsius is 32 deg Fahrenheit at sea level
boiling [email protected] deg Celsius is 212 deg Fahrenheit at sea level.
0 degrees Fahrenheit is -17.778 degrees Celsius
Here ends 3rd form science class !!! What school year's that called now? Lol.

Some of the girls n guy's in Alaska can probably provide you with a real life answer? Cheers Bob
10 Aug 2016
@ 02:07 pm (GMT)

Bryan Webster

Re: What's the best powder for a 7 mag in -30 to 30 degrees
It would be best that you get a reloading manual for the bullet brand you plan to use to start with. Then visit the web sites of the powder manufacturers like IMR as well as Hodgdons to read the detail on their powders they claim are the most temperature insensitive and go from there to working out a load.

TO answer the question you asked is not entirely possible without knowing the exact brand, weight etc for your bullet since each bullet maker has loads that will not be sage to assume can be used for other brands. For example H4350 is among the best for being temperature safe, but what if the bullet you have in mind is not listed in your reloading manual for that powder.

Either look up all the info you need online or ask a more detailed question here.

You could start here:

https://www.hodgdon.com/extreme.html

or here

http://www.imrpowder.com/PDF/Enduron%20Info%20Sheet.pdf
10 Aug 2016
@ 11:19 pm (GMT)

Bob Wiggins

Re: What's the best powder for a 7 mag in -30 to 30 degrees
Fahrenheit, sorry about that. 162 ELDX will be my preferred bullet. 24" barrel
Lots of reload data to look at but.... Not info on temp sensitivity. Thanks
11 Aug 2016
@ 12:13 am (GMT)

Warwick Marflitt

Re: What's the best powder for a 7 mag in -30 to 30 degrees
Well start at book middle load weight. Pop them in the freezer with a thermometer and when they're freezing cold test fire and look for pressure signs! Or ring the guide companies in Alaska and ask them what ammo they're using. Email Hornady and ask if superformance is ok to use below zero Fahrenheit? The answer is out there as people are doing it for survival all around the world? Ring the ammo companies that sell high quality ammo.! The squeaky wheel gets the oil!!!!!! Start shaking the trees and see what fruits land at your feet? The answer is out there........... You can do a ladder test with factory ammo at different temperatures shot over cronny at 100 yards to get velocities and bullet drops? Have fun and be safe.
11 Aug 2016
@ 06:38 am (GMT)

Thomas Kitchen

Re: What's the best powder for a 7 mag in -30 to 30 degrees
hi Bob
i would try h4831 or h1000 work up loads on a day that isn't hot.
i believe if it the temperature does effect your loads if you worked them up in a warmer environment the cold will make them slower so at least you won't have any safety issues.
like Warwick said you could put them in the freezer then test them but not sure how close your freezer is to your range.
what kind of rangers are you planning on shooting to?
11 Aug 2016
@ 01:51 pm (GMT)

Bryan Webster

Re: What's the best powder for a 7 mag in -30 to 30 degrees
If you will note on this link, the H1000 is part of the Hodgdon Extreme powders that are listed as being temperature insensitive as per my previous message. If as was stated by Thomas, you load with this one in warm weather, you are still good to go for down to -40C

But when you travel to your colder destination you will still have to check your rifle's zero at the temperatures/elevation there or the point of impact may be off enough to cause an issue.

https://www.hodgdon.com/extreme.html

If you were to start your loading at 64 grains and work upwards in .5 grain increments until you find the load your rifle likes, then fine tune it in .2 grain amounts above and below an accurate node, you should find what you need. Hornady shows this powder maximum load at 68.5 grains which may not be safe in your rifle.
11 Aug 2016
@ 08:55 pm (GMT)

Nathan Foster

Re: What's the best powder for a 7 mag in -30 to 30 degrees
Hi Bob, as the others have said, H1000 is the best choice. If you do your load work now before fall and winter, you will be just fine. You may lose a bit of velocity at -30 but the load will be safe. It can also pay to run a mag primer for greater consistency. I suggest the Federal 215, especially for a 24" barrel running H1000.

My reloading book has more info. I believe my pet loads for 162gr are in the Cartridges book. None of this can be found in the manuals.
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