Temperature Sensitivity - The HuntingPA.com Outdoor Community
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post #1 of 10 (permalink) Old 12-12-2016, 11:28 PM Thread Starter
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Temperature Sensitivity

Hi guys, I am a newer reloader about 2 years now and I am little paranoid. I load for 7mm-08, 30/06 380 & 38/357. I am having a hard time getting my model 7 7mm-08 to group less than 1.75". A fellow at the range has the same rifle and is getting .5" groups. So he shared his load data and also mentioned that the powder was on sale at field and stream so on the way home I purchased a lb. The powder is H414. After doing some research online the words temp sensitivity came up. Some mentioned using a magnum primer. I called Hodgden about that and they did not reccomend the mag primer but did mention that the powder was temp sensitive. The tech told me a story about going over pressure when hot. So now I am seeking advice.

Other reviews said that the powder showed no sensitivity. What are your experiences?

So here are my questions.

At what temperature should I work up a load? As all Pennsylvanians know during bear season there can be a 60 degree temp difference. I would hate to be spot on on Saturday but low on Monday. Or overpressure if its hot. Orrrrrr am I just being paranoid. Sorry for the long post.
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post #2 of 10 (permalink) Old 12-13-2016, 03:12 AM
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Stay with stick type powder!
Don't believe everything you hear at the range?
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WILLY P
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post #3 of 10 (permalink) Old 12-13-2016, 05:35 AM
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Number two rule, STAY AWAY from ball powder in rifles, especially hunting in cold weather ones...do yourself a favor in the long run ...
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post #4 of 10 (permalink) Old 12-13-2016, 07:39 AM
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If your like me you don't want to buy powder to know if it is extruded or ball.This will help you out a little.If anyone on here knows where a list of powder type can be found please post it or type in all you know that are as a fact the type and not I think so.

MSDS

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post #5 of 10 (permalink) Old 12-13-2016, 07:45 AM
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For more type any powder manufacturers name the leave a space and enter msds.By law it has to be available.

Bob Seger,till it shines.
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post #6 of 10 (permalink) Old 12-13-2016, 08:57 AM
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I have used w760 for awhile now it's the same as h414. I use it in my 30/06 with great results. I have never got over pressure when warm or poi change when cold. I read some reviews and got worried. So I tested it out. Tossed some bullets in the freezer and tossed some by a floor heater. It was around 80 out. Didn't change poi or show signs of pressure. And I use a standard primer.
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post #7 of 10 (permalink) Old 12-13-2016, 09:20 AM
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IMR 4064 is a well known and popular powder for a wide range of applications. I have never had a problem with any reloading I have done with this powder relative to accuracy, velocity or function in all types of weather conditions. There may be some load data that calls for magnum primers to ignite 4064 but I have never had to use any primer other than the garden variety Remington or Winchester with it.

Getting strapped-up with powder performance in different weather conditions can lead to an unsolved mystery and over thought processes. I once hunted with a guy who claimed that before he took a shot he had to tip the muzzle of his .270 to the sky so that the powder in the case contacted the primer cup. Claimed it was critical to accuracy and velocity. Maybe at the Camp Perry rifle matches, but not in Indiana County during deer season no matter what the temperature or relative humidity is.

shoot it, shoot it again.
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post #8 of 10 (permalink) Old 12-13-2016, 12:01 PM
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Many Variables

Quote:
Originally Posted by hct4all View Post
I am having a hard time getting my model 7 7mm-08 to group less than 1.75". A fellow at the range has the same rifle and is getting .5" groups.
Accuracy or lack of it can be from many other variables beside powder choice. Could be your barrel, trigger pull, bullet choice (shape/weight), optics and your own shooting ability. Don't focus on the powder only. FT

Last edited by Freytown; 12-13-2016 at 12:05 PM.
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post #9 of 10 (permalink) Old 12-13-2016, 12:50 PM Thread Starter
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Thanks for the replies. I know that powder is not a magic cure all for the accuracy but it seems its a major component. I have tried 139 gn SST with 4064 and 150 gn Nosler Partition with Reloader 15. Just looking to try something people have had good luck with. The model 7 has a 20" barrel.
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post #10 of 10 (permalink) Old 12-13-2016, 01:16 PM
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I have one of the original 7's with the pencil thin 18" barrel. I haven't worked with it a lot but it isn't a stellar shooter similar to yours. But in the last 30+ years I've shot a LOT of deer with it and so has my daughter. There is no issue taking deer at 200yds with that kind of accuracy.

I use H414 in it, 44gr, 140 ballistic tip for right at 2600fps. If you contact Hodgdon they will give you the temp/fps variations for it. But all powder is subject to temp sensitivity and ranges from about 0.2fps per degree to about 1.5fps per degree with possible variability across the range. In other words, some powders may be consistent across the temp range, others may be consistent up to a certain temp and then become more unstable above it.

Not sure what you have available but you can test it with some ingenuity. I was preparing for an early spring arctic hunt, temps expected around -40F. Was concerned about point of impact and simply if the gun would function. I put gun loaded and all the ammo in my freezer for a few days. Then each morning I'd take it out and fire a single shot at the same 100yd target, load it and put it back in the freezer until the I did it again on another morning. Didn't chrony every morning but a few to see what I got. But I have the luxury that my shooting range starts about 4 steps out my back door. Haven't done it but you could use a hairdryer or maybe the heater in the car to go the other way. I have used the AC in the car for cooling barrels so I didn't need to wait so long between shots.

I use 760 in my 375HH and I think it performs similar to 414. I load it to max and used it in extreme heat in Australia and Africa without issue.

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