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cold weather powder for 300 RUM

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cold weather powder for 300 RUM

Old 08-18-2012, 06:04 PM
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Join Date: Aug 2012
Location: SE VA
Posts: 2
Default cold weather powder for 300 RUM

my brother-in-law is being given a top-end whitetail hunt in north canada where the ideal temp is -20 F for deer moving in Nov. another friend gave him a 300 RUM with this hunt in mind; not my recommendation but that's what i have to work with, as i reload for him. balancing all factors given the cartridge, i'm thinking i'll try 180 grain bullets as shots tend to be 150-200 yards and bucks usually 250 lbs +. if accuracy isn't satisfactory i can try 165s and 200s i have.

my question: any recommendations for a minimally temperature sensitive?

i have already told him to re-sight in when he arrives and expect a difference in POI.
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Old 08-18-2012, 06:05 PM
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Location: SE VA
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sorry, neglected to say minimally temp sensitive POWDER
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Old 08-18-2012, 09:28 PM
Join Date: Jan 2009
Posts: 70

Can't give you a great answer, but I can say RL-22 (a great powder for the caliber) is regarded as pretty sensitive. There needs to be a lot more research done on the subject, but the powder manufacturers aren't going to do it.

Also, many variants of the "same" powder (such as 4831 types) are often different in how they deal with temps. You're right to tell him to be careful. I'd say just load him a ton of rounds so he can sight in there. He should be grateful to reimburse you for a couple of boxes of ammo if he's paying hundreds for the airfare.
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Old 08-19-2012, 04:15 AM
Typical Buck
Join Date: May 2009
Location: Colorado
Posts: 797

I hate to say it but at 150-200 yard shots you could almost get away with a 4" group and still make 100% kill shots. That was rough to type. The Load I worked up for a friend was.

180 gr accubond with 94 grains of RL-25 best groupings were 3/4" and could consistently shoot milk jugs at 700 yards. The Remington rifle seem to like the Reloader powder the best of all and I'm not much of a Reloader powder fan. But that's a large case.

The ultra mag is a bit excessive for 150yard shots but I'm sure it will kill a deer stone cold dead.
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Old 08-20-2012, 07:32 PM
Nontypical Buck
Join Date: Feb 2003
Posts: 3,516

Check www.hodgdon.com ,or call (913) 362-9455 for information information on thier Extreme Powders. They are created for temperature extrems. Good luck.
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Old 08-30-2012, 06:48 AM
Typical Buck
Join Date: Oct 2003
Posts: 579
Default Powder

For the overbore case you're working with I think H1000 & Retumbo are going to be your best bet. Since you're dealing with 200 yard or less shots I wouldn't worry too much about velocity and I would load for accuracy with whatever powder.
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Old 09-19-2012, 11:55 PM
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Join Date: Feb 2003
Location: Saskatchewan Canada
Posts: 6,921

H1000 has proven well in the 338 lapua. We have a 100 degree variance in temperature here so while not the arctic it can be darn cold.
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Old 09-29-2012, 07:01 AM
Join Date: Apr 2011
Location: Florissant, Colorado
Posts: 62

H1000 and Retumbo work great in my 300 RUM, hot or cold weather.
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Old 10-13-2012, 10:15 PM
Fork Horn
Join Date: Jan 2008
Posts: 132

I know nothing about loading a 338, but Win 760 and 748 are both good choices when shooting in cold weather. I have had good luck with both of these powders in my reloads and I have hunted in MN for over 15 years with these loads in my 30 cals. In some of my loads I also use Mag primers because of the extreme cold.
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Old 10-14-2012, 07:13 PM
Typical Buck
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Join Date: Dec 2004
Location: Nebraska
Posts: 601

I would go with IMR7828 SSC and a magnum primer.

A Hodgdon published Starting load with a Barnes 180 GR. TTSX BT:

74.4grains 2851fps 48,900 PSI

Max Load: 80.0grains 3107fps 62,700 PSI
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