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How temp sensitive is 4064? #15097997 07/31/20
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David_Walter Offline OP
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How temp sensitive is 4064?

It looks like it works in the same cartridges with the same weight bullets as Varget.

I live in the desert eastern WA (was 105 yesterday, only 100 now), gets down to the teens in winter.

I’d like to get an idea of velocity and pressure swings.

308 and 6.5 Creedmoor mostly.


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Re: How temp sensitive is 4064? [Re: David_Walter] #15099198 07/31/20
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Great question.

I'm looking forward to the responses as well.


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Re: How temp sensitive is 4064? [Re: David_Walter] #15099504 08/01/20
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devnull Offline
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See this thread below. There is a good burn chart there that shows IMR4064 changes .45 fps/degree. Varget on the other hand shows .13 fps/degree.

https://forum.accurateshooter.com/threads/temperature-sensativity-of-cfe-223.3969612/

Re: How temp sensitive is 4064? [Re: David_Walter] #15099578 08/01/20
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David- I shoot and have shot many-many pounds of IMR4064 in .308 with no issues. Sounds like our air temps are very similar. It’s mid 90’s here now and come rifle season it’ll be 20’s in the mornings.
I run max/near max charges, it seems that’s what my .308’s like. I’m big on 165’s, they usually always exit critters and have plenty of energy way out there. I haven’t checked speeds, I never have got hung up on velocities.
I usually find pressure and back down.

I could run 4064 and 4350 and never look back.

Re: How temp sensitive is 4064? [Re: David_Walter] #15099701 08/01/20
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David_Walter Offline OP
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Thanks guys.


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Re: How temp sensitive is 4064? [Re: David_Walter] #15099808 08/01/20
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I agree with gunnut308. I too use it in .308 and have never had any issues. I too am in the Southeast and have never had issues with it. Then again, I'm not one to run the ragged edge either. I also use RL-15 when competing in FTR and never had issues.

I believe the MK316 Mod 0 round the military uses calls for a 175 gr Matchking and 41.75 gr of IMR 4064 and a Lake City case. Back when this was developed, I remember guys mentioning that 4064 was chosen due to being fairly temp stable.

As for the 6.5 CM, not sure which grain bullet you're loading for. However, if shooting the 140s, I've had some really good luck with RL-16 which has been really temp stable.

Re: How temp sensitive is 4064? [Re: David_Walter] #15099831 08/01/20
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I've always run 4064, 3031, IMr 4895, for a lot of the reasons listed above.. in every thing from a 223 on up...to include magnums..

never had a problem and always consistent, regardless of load or caliber, or outside temp.. hot or cold..




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Re: How temp sensitive is 4064? [Re: David_Walter] #15100068 08/01/20
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Back in the late 80's and early 90's IMR 4064 was my go-to powder for .308/.243. (I shot a pile of it at whitetails and groundhogs) I never noticed a difference in velocity when confronted with a drastic temperature change and I dont think 95% of shooters ever would notice.... BUT now that Hodgdon makes the excellent Varget powder that according to the data I have read is very temp stable, My thoughts are why shoot anything else? Unless Varget is nowhere to be found and IMR 4064 is avialable then I would have no problem going back to my old friend IMR 4064 👍.....Good luck....Hb

Re: How temp sensitive is 4064? [Re: David_Walter] #15100249 08/01/20
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I've never noticed, or even thought about, temp change with 4064, but that could be because in the 35 Whelen, loads were developed in the fall & winter & that's when the rifle was used most. Also in 30-06/150 match loads they were developed in spring/summer for spring/summer use. It works well in many cartridges, but not always the best. There are still a few pounds of it in the closet. Just in case.


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Re: How temp sensitive is 4064? [Re: David_Walter] #15101294 08/01/20
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A decade or so ago SoCom was unhappy with the performance of their DM ammo in the sandbox. They were having real problems with temp sensitivity with the current load.

After throwing out more stringent procurement specifications, and after testing every powder that was available, the powder that would perform to their specs was 4064..or at least that's the one they picked.

4064 has been one of my preferred powders since the 60's, it's a little on the fast end for 6.5 but will perform very well..


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Re: How temp sensitive is 4064? [Re: David_Walter] #15101478 08/01/20
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AussieGunWriter Offline
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Originally Posted by David_Walter
How temp sensitive is 4064?

It looks like it works in the same cartridges with the same weight bullets as Varget.

I live in the desert eastern WA (was 105 yesterday, only 100 now), gets down to the teens in winter.

I’d like to get an idea of velocity and pressure swings.

308 and 6.5 Creedmoor mostly.


There is no such thing as temperature swings in most hunting seasons. If you use more sensitive powders in extreme ranges outside hunting season temperature, you "might" see a difference or "might" not. Aussie hunting season is anytime of year, so the temperature ranges are quite high but I never noticed any difference in the field apart from using 760 in temperatures around the Ton but having said that, never experienced a miss but did notice much hotter barrels with lesser shots. I saw more issues hunting with improperly sealed wooden stocks in rain. The swelling of a stock in rain can toss accuracy into a memory very fast. Even a heavy shower can be enough to teach you more than you want to know.


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Re: How temp sensitive is 4064? [Re: David_Walter] #15103940 08/02/20
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Mostly a Long Range / dope issue...


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