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Joined: Feb 2001
Posts: 4,571
Campfire Tracker
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Campfire Tracker
Joined: Feb 2001
Posts: 4,571 |
I shoot a lot of both IMR4064 and IMR4350, in the .223, .243, .260, 7/08, etc..... Once it gets below about 10 degrees, I’ve found shooter temp sensitivity to play a much larger roll in accuracy/POI shifts.... than powder temp sensitivity.
You better pray to the God of Skinny Punks that this wind doesn't pick up......
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Joined: Jul 2001
Posts: 60,170 Likes: 17
Campfire Kahuna
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Campfire Kahuna
Joined: Jul 2001
Posts: 60,170 Likes: 17 |
MontanaMan,
Haven't done any formal testing of either, but both have been consistent.
One thing mentioned in the article is that so far I've never cold-tested a powder claimed to be temperature-resistant that didn't work well at zero.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
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Joined: Jul 2001
Posts: 60,170 Likes: 17
Campfire Kahuna
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Campfire Kahuna
Joined: Jul 2001
Posts: 60,170 Likes: 17 |
Dogshooter,
That can be a factor!
However, when I do my zero-degree testing I pick days that are calm, and usually sunny, because quite often high pressure results in those conditions during Montana winters. It's actually usually pretty pleasant, at least for a native Montanan of Norwegian ancestry. I shoot the rifles over a benchrest, with a warmed-up pickup nearby in case I need to reheat either the shooter or the chronograph.
I described all my methodology (including this) in the article, but have discovered over the 15+ years I've been a Campfire member that most people don't want to read 2000+ word articles. Instead they want the 3-sentence Internet version of knowledge.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
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Joined: Nov 2003
Posts: 3,611
Campfire Tracker
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Campfire Tracker
Joined: Nov 2003
Posts: 3,611 |
I described all my methodology (including this) in the article, but have discovered over the 15+ years I've been a Campfire member that most people don't want to read 2000+ word articles. Instead they want the 3-sentence Internet version of knowledge.
Yep, give it to me now, now, now!
Shew me thy ways, O LORD: teach me thy paths. "there are few better cartridges on Earth than the 7 x 57mm Mauser" "the .30 Springfield is light, accurate, penetrating, and has surprising stopping power"
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Joined: Mar 2005
Posts: 26,283 Likes: 4
Campfire Ranger
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Campfire Ranger
Joined: Mar 2005
Posts: 26,283 Likes: 4 |
I shoot a lot of both IMR4064 and IMR4350, in the .223, .243, .260, 7/08, etc..... Once it gets below about 10 degrees, I’ve found shooter temp sensitivity to play a much larger roll in accuracy/POI shifts.... than powder temp sensitivity. Yes, I've noticed chattering teeth for some strange reason makes it more difficult to achieve small groups too!
Casey
Not being married to any particular political party sure makes it a lot easier to look at the world more objectively... Having said that, MAGA.
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Joined: Nov 2008
Posts: 747
Campfire Regular
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Campfire Regular
Joined: Nov 2008
Posts: 747 |
John, I enjoy your 2000+ word articles because everything you write is knowledge to me. After reading your articles and books for many years I can't say I've disagreed with anything you wrote. I've been reloading and making bullets for 58 years and I'm still learning.
Mike
NRA Patron Member
If its "Made in America", its not setting on a container ship!
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Joined: Sep 2010
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Campfire Ranger
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Campfire Ranger
Joined: Sep 2010
Posts: 19,179 |
John, I enjoy your 2000+ word articles because everything you write is knowledge to me. After reading your articles and books for many years I can't say I've disagreed with anything you wrote. Mike
Oh Please ! Don't do that. His wife has hard enuff time dealing w/him as it is. Jerry
jwall- *** 3100 guy***
A Flat Trajectory is Never a Handicap
Speed is Trajectory's Friend !!
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Joined: Oct 2008
Posts: 8,748
Campfire Outfitter
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Campfire Outfitter
Joined: Oct 2008
Posts: 8,748 |
John,
Any info on the temp sensitivity of AR-Comp & IMR-8208 XBR?
Thanks.
MM In a few observations with 8208 I’ve found it to be as good as it gets. Basically no difference from 70 to 10-20 deg
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Joined: Jul 2001
Posts: 60,170 Likes: 17
Campfire Kahuna
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Campfire Kahuna
Joined: Jul 2001
Posts: 60,170 Likes: 17 |
Joe,
OK, here they are three sentences, this being the first one:
1) If you hunt in widely different temperatures, use a temperature-resistant powder.
2) If for some reason you can't, then you should actually shoot YOUR ammo in YOUR rifle before going hunting, to find out what happens.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
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Posts: 45,259 Likes: 21
Campfire 'Bwana
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Campfire 'Bwana
Joined: Sep 2011
Posts: 45,259 Likes: 21 |
Joe,
OK, here they are three sentences, this being the first one:
1) If you hunt in widely different temperatures, use a temperature-resistant powder.
2) If for some reason you can't, then you should actually shoot YOUR ammo in YOUR rifle before going hunting, to find out what happens. John, Jeez, there you go with a concise and logical reply again. On the internet no less I didn't know gack came in that form. Geno PS, test firing my rifle and ammo BEFORE hunting? How many years have I been hearing that? PPS, I'll have to look for that article in the issues I just received. After retiring and relocating to our place in CA some issues of Rifle and Handloader didn't follow me. I called the subscription dept and could not be happier with the service. 3-4 days and they were in my PO box.
The desert is a true treasure for him who seeks refuge from men and the evil of men. In it is contentment In it is death and all you seek (Quoted from "The Bleeding of the Stone" Ibrahim Al-Koni)
member of the cabal of dysfunctional squirrels?
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Joined: Sep 2006
Posts: 23,647 Likes: 1
Campfire Ranger
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Campfire Ranger
Joined: Sep 2006
Posts: 23,647 Likes: 1 |
MontanaMan,
Haven't done any formal testing of either, but both have been consistent.
One thing mentioned in the article is that so far I've never cold-tested a powder claimed to be temperature-resistant that didn't work well at zero. Thank You. MM
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Joined: Nov 2003
Posts: 3,611
Campfire Tracker
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Campfire Tracker
Joined: Nov 2003
Posts: 3,611 |
John, I was just yanking your chain, I read your article. And remember, a huge number don't comprehend what they read so they need it to be short. (That's not what she said)
Last edited by Joe; 01/25/18.
Shew me thy ways, O LORD: teach me thy paths. "there are few better cartridges on Earth than the 7 x 57mm Mauser" "the .30 Springfield is light, accurate, penetrating, and has surprising stopping power"
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Joined: Jul 2001
Posts: 60,170 Likes: 17
Campfire Kahuna
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Campfire Kahuna
Joined: Jul 2001
Posts: 60,170 Likes: 17 |
Joe,
Yeah, I knew that!
I was just yanking the chain of the people who want it all in three sentences....
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
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Joined: Sep 2010
Posts: 19,179
Campfire Ranger
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Campfire Ranger
Joined: Sep 2010
Posts: 19,179 |
HEY ! Wait a minute ! ! lol
Jerry
jwall- *** 3100 guy***
A Flat Trajectory is Never a Handicap
Speed is Trajectory's Friend !!
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Joined: Jul 2004
Posts: 347
Campfire Member
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Campfire Member
Joined: Jul 2004
Posts: 347 |
vires,fortitudo,vigilantia
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