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#7243502 - 08/02/18 07:16 PM Load testing in the heat??
Buzzsaw Offline
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Registered: 06/29/11
Posts: 13765
Loc: Frisco, Texas
So, this time of year when its 95* in the shade, your at the bench testing loads for this fall/Winters hunts. When I was shooting 400 yard clays, we would sometimes put our ammo boxes in an ice chest or at least in the shade to keep them "cool"

I'm shooting 42.4gr H4350 in my 6.5 Creed, 140/143gr bullets

will it make a hill of beans as far as higher pressures (velocity difference) now and in December?

Or am I overthinking AGAIN??
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#7243554 - 08/02/18 07:56 PM Re: Load testing in the heat?? [Re: Buzzsaw]
wp75169 Online   content
Extreme Tracker

Registered: 10/11/09
Posts: 4901
Loc: Wills Point
I donít know about 4350 and should since I use it but some powders such R19 and 17 are very temp sensitive. Iím sure all would be fine hunting inside 150 yards. Summer to winter you may wind up hitting the next clay down. Believe me, if Varget worked well in everything I wouldnít own anything else.

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#7243565 - 08/02/18 08:02 PM Re: Load testing in the heat?? [Re: Buzzsaw]
scottfromdallas Online   content
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Registered: 06/23/15
Posts: 1203
Loc: TX
Originally Posted By: Buzzsaw


Or am I overthinking AGAIN??


I think so. Extreme are very temp stable. Plus it will probably be 50 degrees in December.
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#7243635 - 08/02/18 09:09 PM Re: Load testing in the heat?? [Re: Buzzsaw]
patriot07 Online   content
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Registered: 11/06/11
Posts: 2556
Loc: Royse City, TX
For long range precision purposes, you should be aware that differences in DA and cartridge pressure will both make your shot require less elevation correction this time of year. For hunting inside 400 yards, it's irrelevant. For target shooting small targets at 600+, you should be aware of the conditions when you get your data and how different conditions later on will impact your trajectory.

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#7243638 - 08/02/18 09:12 PM Re: Load testing in the heat?? [Re: Buzzsaw]
FiremanJG Offline
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Registered: 12/16/08
Posts: 26349
Loc: Wolfe City, TX
Load development in the heat is the perfect time. If it doesn't over pressure now, it's good all year. Only one more step that can be made to ensure "bomb proof" ammo, and that is hot weather, as well as dip the cartridge in water, then chamber and shoot it.

I've shot The Heatstroke Open for 7 years now, and in 100į F, no shade for two days, and not much cooling time between stages. Let em rip!

(Just don't do it on 7th loaded brass) peep
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#7243639 - 08/02/18 09:12 PM Re: Load testing in the heat?? [Re: patriot07]
FiremanJG Offline
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Registered: 12/16/08
Posts: 26349
Loc: Wolfe City, TX
Originally Posted By: patriot07
For long range precision purposes, you should be aware that differences in DA and cartridge pressure will both make your shot require less elevation correction this time of year. For hunting inside 400 yards, it's irrelevant. For target shooting small targets at 600+, you should be aware of the conditions when you get your data and how different conditions later on will impact your trajectory.


nidea
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#7243664 - 08/02/18 09:31 PM Re: Load testing in the heat?? [Re: Buzzsaw]
TackDriver Online   content
Tracker

Registered: 05/02/14
Posts: 920
A tip if I may, If you find a wide node in hot weather, try to use the charge of the higher side of the wide node so when the cold weather comes, you will decrease some velocity and still be inside the node. Just a heads up.

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#7243672 - 08/02/18 09:41 PM Re: Load testing in the heat?? [Re: Buzzsaw]
RiverRider Offline
THF Trophy Hunter

Registered: 11/11/07
Posts: 8223
Loc: Wise Co.
Good tip, Tack.

I've been loading and testing like a madman these last couple of months for these reasons. I I have ONE last load to verify, and I will be completely done with my rifles. I don't think I've been in this position since 1997.

I think I smell a rifle swap coming.
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#7243675 - 08/02/18 09:48 PM Re: Load testing in the heat?? [Re: TackDriver]
patriot07 Online   content
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Registered: 11/06/11
Posts: 2556
Loc: Royse City, TX
Originally Posted By: TackDriver
A tip if I may, If you find a wide node in hot weather, try to use the charge of the higher side of the wide node so when the cold weather comes, you will decrease some velocity and still be inside the node. Just a heads up.
This is a good tip as well.

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#7243691 - 08/02/18 10:11 PM Re: Load testing in the heat?? [Re: TackDriver]
kmon1 Online   content
junior

Registered: 09/27/06
Posts: 23581
Loc: Texas
Originally Posted By: TackDriver
A tip if I may, If you find a wide node in hot weather, try to use the charge of the higher side of the wide node so when the cold weather comes, you will decrease some velocity and still be inside the node. Just a heads up.


Good tip, I added the quite to the tips and tricks sticky
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#7243707 - 08/02/18 10:38 PM Re: Load testing in the heat?? [Re: Buzzsaw]
ChadTRG42 Online   happy
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Registered: 09/16/09
Posts: 13697
Loc: Lewisville, TX
No powder is immune to temp sensitivity. But H4350 is less than others. Even during Jason's tactical match when it was 100-107 degrees I got 2 cases with slight gas leak around the primer pocket (H4350 is my powder for my 6.5x47). (And I even dialed my load down .4 grains from where it was.) Once I saw this, I put my ammo in my small 6 pack cooler to cool off. I didn't have an issue after that. I also kept my metal AI magazine in there, so it didn't get too hot to cook the rounds hotter.

So, can the heat effect your load- yes, of course. When it's 90+ degrees for load work up, and you go and shoot that ammo in 20-30 degrees, yes, you can see a difference in the accuracy, speed, and pressures. Shooting and testing in this heat helps to know where your upper limit of pressure is for sure, where you know you should be safe in the winter time. But there still can be a variation between the 2 temp extremes.
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#7243777 - 08/03/18 05:35 AM Re: Load testing in the heat?? [Re: Buzzsaw]
RiverRider Offline
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Registered: 11/11/07
Posts: 8223
Loc: Wise Co.
Positively true.

Some who have opportunity to take advantage of extreme temperature ranges have noted that many of these new powders exhibit excellent response to very low temperatures, but still will burn a little faster at the high end of temperature ranges.

One of the better powders in the 4350 range of burn rate is Re16, which is actually a double base extruded powder. It is more consistent that IMR 4451, which is single base. How Alliant pulled that off, I don't know...but to borrow a phrase from North Dallas Forty, better shooting "through chemistry!"
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#7243797 - 08/03/18 05:57 AM Re: Load testing in the heat?? [Re: RiverRider]
dee Online   content
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Registered: 04/10/10
Posts: 5513
Loc: Red River way
Originally Posted By: RiverRider
Positively true.

Some who have opportunity to take advantage of extreme temperature ranges have noted that many of these new powders exhibit excellent response to very low temperatures, but still will burn a little faster at the high end of temperature ranges.

One of the better powders in the 4350 range of burn rate is Re16, which is actually a double base extruded powder. It is more consistent that IMR 4451, which is single base. How Alliant pulled that off, I don't know...but to borrow a phrase from North Dallas Forty, better shooting "through chemistry!"


Reloader 16 and 23 are bad to the bone.
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#7243845 - 08/03/18 07:20 AM Re: Load testing in the heat?? [Re: dee]
DStroud Offline
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Registered: 11/02/11
Posts: 1838
Loc: In the Right lane
Originally Posted By: dee
Originally Posted By: RiverRider
Positively true.

Some who have opportunity to take advantage of extreme temperature ranges have noted that many of these new powders exhibit excellent response to very low temperatures, but still will burn a little faster at the high end of temperature ranges.

One of the better powders in the 4350 range of burn rate is Re16, which is actually a double base extruded powder. It is more consistent that IMR 4451, which is single base. How Alliant pulled that off, I don't know...but to borrow a phrase from North Dallas Forty, better shooting "through chemistry!"


Reloader 16 and 23 are bad to the bone.


Yes they are but letís not talk about that .... Shhhh ninja
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#7243875 - 08/03/18 07:43 AM Re: Load testing in the heat?? [Re: Buzzsaw]
Buzzsaw Offline
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Registered: 06/29/11
Posts: 13765
Loc: Frisco, Texas
thanks everyone
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