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#3170775 - 11/08/18 10:17 PM Re: Temperature sensitivities for powders [Re: Hcboy]
rudymontana Offline
Die Hard Member II

Registered: 11/25/14
Posts: 1035
Loc: Montana,USA
Interesting figures! Still go to the range when seasons change and check the zero. I put my coyote rounds away after the season. I load up for P.D. season in late spring and zero the rifle again. I haven't shot any of the above powders, just the CF&E in my 223 and 204.

Rudy

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#3170776 - 11/08/18 10:18 PM Re: Temperature sensitivities for powders [Re: 19grizz69]
spotstalkshoot Online
Die Hard Member II

Registered: 12/22/13
Posts: 1502
Loc: so.mn
That's why I like Varget and H4895.

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#3170814 - 11/09/18 08:54 AM Re: Temperature sensitivities for powders [Re: Bob_Atl]
Bob_Atl Online
Die Hard Member III

Registered: 01/09/15
Posts: 2064
Loc: in the field, or not..
here's another chart, found it on the 6.5 G forum, again fwiw..


and took the previous chart then sorted it, twice....
no surprise these two charts are very close but not exact !!




Edited by Bob_Atl (11/11/18 03:49 PM)
Edit Reason: added SuperFormance
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#3170837 - 11/09/18 12:27 PM Re: Temperature sensitivities for powders [Re: Hcboy]
Matt1953 Offline
moderator

Registered: 11/28/09
Posts: 1228
Loc: Alamogordo, New Mexico
Great info guys. I’m going to make this a sticky.
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#3172208 - 11/17/18 09:12 PM Re: Temperature sensitivities for powders [Re: Hcboy]
Lodgepole Online
Die Hard Member

Registered: 12/16/15
Posts: 551
Loc: montana
Help ! What does the # mean ! such as CFE --1.72 ? Is it a percentage of the ????
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#3172213 - 11/17/18 09:42 PM Re: Temperature sensitivities for powders [Re: Hcboy]
204 AR Offline
Die Hard Member with a vengeance

Registered: 01/31/10
Posts: 4582
Loc: Nebraska
I believe it means 1.72 fps change per degree difference.
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#3172214 - 11/17/18 10:05 PM Re: Temperature sensitivities for powders [Re: Hcboy]
GLShooter Offline
PM Sponsor

Registered: 01/09/05
Posts: 4925
Loc: AZ
Yep.

Greg
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#3172232 - 11/18/18 12:22 AM Re: Temperature sensitivities for powders [Re: Hcboy]
Lodgepole Online
Die Hard Member

Registered: 12/16/15
Posts: 551
Loc: montana
GL & 204 Thanks for this info .OK ,so if it is 50 degrees colder then 50 x 1.72 fps slower .That is not going to make a bunch of difference if I am getting this right ? 86 FPS slower. Thank you both
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#3174858 - 12/01/18 04:38 PM Re: Temperature sensitivities for powders [Re: Lodgepole]
firehunt77 Offline
New Member

Registered: 07/06/18
Posts: 3
Loc: Kansas
I am very good friends with the Hodgdon family and I have a couple of friends that work at Hodgdon powder company. I have asked the same question about temp sensitive powders. Their answer in short is, any Hodgdon "extreme" powder or any IMR "enduron" powder is temp stable. Other powders that are not in the Extreme or Enduron lines will be effected more by temperature swings. Also, all temp stable powder is an extruded powder. However, not all extruded powder is temp stable. I can't speak for other powders out there since I only use Hodgdon and IMR. Hope this helps a little.

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#3181792 - 12/31/18 12:43 PM Re: Temperature sensitivities for powders [Re: firehunt77]
HunterLee Offline
Die Hard Member

Registered: 01/09/07
Posts: 564
Loc: Mn
BLC2 is not a cold weather powder and found that the hard way. Shot great in the fall working on a load. Come coyote season I was key howling but it was -10.

All my coyote loads are extreme loads. When it gets real cold, like -20, even they seem to lose a little bit.

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#3181822 - 12/31/18 02:27 PM Re: Temperature sensitivities for powders [Re: HunterLee]
Redneckbmxer24 Offline
Seasoned Member

Registered: 01/08/13
Posts: 165
Loc: Winchester, VA
Originally Posted By: HunterLee
BLC2 is not a cold weather powder and found that the hard way. Shot great in the fall working on a load. Come coyote season I was key howling but it was -10.

All my coyote loads are extreme loads. When it gets real cold, like -20, even they seem to lose a little bit.


If you're key holing it's not the powder and most likely not related to the decrease of velocity although that could play a small roll. More than likely it was the drop in temperature as that plays a larger role in stability than 100fps or so in velocity loss.

Most likely your bullet was on the ragged edge of stability and the temperature drop threw it out. The lower the temperature the lower your stability factor will be. Berger has a handy stability calculator that you can play around with by entering your bullet info and twist rate (always best to measure yours since they can easily vary as much as .5"). It's a nice tool to check out.

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#3192278 - 02/11/19 09:02 PM Re: Temperature sensitivities for powders [Re: Redneckbmxer24]
trshootem Offline
Seasoned Member

Registered: 01/12/04
Posts: 168
Loc: Helena, MT
I used CFE223 and BL-C2 in .22-250 and .223 last season, based on that chart it seems pretty accurate. I also noted that CFE appears to be the same powder compound as the BL, but modified with tin oxide? for copper dispersion. I answered my own questions about these in cold weather, so I have gone back the Extreme variety. In .280 Remington, RL19 and RL22 also exhibited some velocity loss in cold weather, typically near zero* or below.

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#3192327 - 02/12/19 12:55 AM Re: Temperature sensitivities for powders [Re: Hcboy]
Plant.One Offline
Die Hard Member with a vengeance

Registered: 02/12/15
Posts: 4141
Loc: Oakland County, MI
i wonder if those numbers in the charts from the 65g forum are caliber and barrel length specific or not?



still a neat reference for comparing sensitivity though as a rough gauge at the very least
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#3192366 - 02/12/19 11:38 AM Re: Temperature sensitivities for powders [Re: Hcboy]
70sdiver Offline
Predator Master

Registered: 03/09/11
Posts: 51
Loc: richland,wa
blc-2 will spike in warm temps if you work up loads in the fall or winter and shoot in the summer.worked up some .223 loads for coyotes temps at testing around 40 degrees and about .05 under max hogden load data.went sage rat shooting at 90-92 degrees and pierced primers.

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#3192943 - 02/15/19 05:54 AM Re: Temperature sensitivities for powders [Re: 204 AR]
wileC Offline
Predator Master

Registered: 04/11/03
Posts: 87
So I would assume the FPS numbers you get from a reloading manual would be a regulated temp of say 70 degrees?

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