I had posted about my bad trigger in the 30-06 which I had taken care of. I really like the Nosler long range 190 grain accubond. I laddered up 9 different loads of 8 and found that 59 grains of Reloader 22 would shoot way less than moa at 100 to 400 yards. This was done at 94 degree weather. I've bought another box of bullets and am wondering when it hits the teens to 30 degrees or so if poi will change or is Alliant stable enough to remain the same. Was also thinking of barrel temperature. I would like to load all these up but don't want to risk it if I need to wait until colder weather to experiment some more. Any ideas.
Loads in 90 degree weather stay or change in colder weather
- Thread starter Wendyj
- Start date
The presures should be lower in colder weather, by how much I don't know. I guessing that if you found a node, and are loading at the upper edge of that node, then you may have some wiggle room are the temps decrease. I would wait for colder weather and try the load just to be sure.
As always I'm just guessing
As always I'm just guessing
Hi. Reloder 22 is supposedly temperature sensitive so you very likely will have some issues in cold weather. Loss of velocity(not a great deal though. Less than 100 fps.) and probably change of zero as opposed to any kind of safety issue.
I'm wondering if some of the posts I read on other forums are about wood stock expanding and contracting when they talk about POI changes. Dunno for sure.
I'm wondering if some of the posts I read on other forums are about wood stock expanding and contracting when they talk about POI changes. Dunno for sure.
With most powders expect roughly 1-2 fps velocity change for every 1 degree temperature changes. Loads developed at 90 degrees will be 70-120 fps slower at 20 degrees, as much as 200 fps slower at 0. They will be 20-40 fps FASTER at 110 degrees and if you're working with a max load could be over pressure in hot temps. While the official temperature listed at your city might be only 90, it is taken in the shade at one location. Actual temperatures in direct sunlight here in North GA can easily be 110-115 degrees in the summer.
H4350 is one of the least temperature sensitive powders and usually runs only about 1/2 fps different as temperature changes. It will still change, just not as much.
H4350 is one of the least temperature sensitive powders and usually runs only about 1/2 fps different as temperature changes. It will still change, just not as much.
I had laddered these up from 56 to 59 in .5 grain increments using 2 different oals. According to Nosler 60 was max load so if pressure goes down in the late Fall I have. Little room to work with. This one is hunting only so I'm guessing I will be out just before deer season to try a few more loads. This is a Remington CDL with wooden stock which is the only bolt gun I have that isn't synthetic. Only other wood stocks are all lever actions. I've heard for years about wood shifting positions around the barrel area in cold and wet weather but have never seen much evidence of it in the lever actions.
There is ammo temp, and then there is chamber temp.
Bart Bobbitt wrote 20 years ago on rec.guns usenet about how he had to aim lower if the round sat in the hot chamber for a few more seconds than usual.
Some powders are better now.
Kombayotch was 5 years ago taking an oven and a cooler to the range and verified the Hodgdon extreme powder claims. He was posting at Snipers hide then, but I think he is mostly a moderator now at canadian guns
http://forum.snipershide.info/showthread.php?t=104302
The 6.5 grendel guy who made this chart [uploaded below] ~7 months ago did not include the temp fps/degree F for IMR4451 and IMR4166 powers with both temp stability and anti Copper fouling coatings. He gleaned info from forums and other web sites.
This guy did include those powders in his test, but he posted 3 weeks ago.
http://precisionrifleblog.com/2016/06/19/powder-temp-stability-hodgdon-extreme-vs-imr-enduron/
Bart Bobbitt wrote 20 years ago on rec.guns usenet about how he had to aim lower if the round sat in the hot chamber for a few more seconds than usual.
Some powders are better now.
Kombayotch was 5 years ago taking an oven and a cooler to the range and verified the Hodgdon extreme powder claims. He was posting at Snipers hide then, but I think he is mostly a moderator now at canadian guns
http://forum.snipershide.info/showthread.php?t=104302
The 6.5 grendel guy who made this chart [uploaded below] ~7 months ago did not include the temp fps/degree F for IMR4451 and IMR4166 powers with both temp stability and anti Copper fouling coatings. He gleaned info from forums and other web sites.
This guy did include those powders in his test, but he posted 3 weeks ago.
http://precisionrifleblog.com/2016/06/19/powder-temp-stability-hodgdon-extreme-vs-imr-enduron/
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math teacher
New member
Reloader 23 is designed to perform similar to Reloader 22 with minimal sensitivity to temperature. Do not interchange loading data however.
g.willikers
New member
It sounds like you might need seasonal ammo.
I took my 3006 and my work up loads to the field and started shooting.
This work up was Imr 4350 , cci 200 primers , new Nosler brass and 165 gr BTs.
I had about 5 loads holding tight in 70* F temps , all useable ( 1" and under ).
I took these loads and shot them at 30* F and was getting 3" groups at 100 yrds.
I tested a new load of W760 , cci 250 , nosler brass and 180 gr pro hunters at 30*F and had .4 groups ( 52.5 charge ).
06.
This work up was Imr 4350 , cci 200 primers , new Nosler brass and 165 gr BTs.
I had about 5 loads holding tight in 70* F temps , all useable ( 1" and under ).
I took these loads and shot them at 30* F and was getting 3" groups at 100 yrds.
I tested a new load of W760 , cci 250 , nosler brass and 180 gr pro hunters at 30*F and had .4 groups ( 52.5 charge ).
06.
As an aside to the PM I sent you, I would keep some of them loaded up for sure and certain for testing and hunting purposes. I had the load I used pretty compressed and that could have easily been the culprit. I have since made it a standard practice to test things through out the year and with some loads that has taken me as much as two years to be completely happy with them.
I like to work things up in the spring just as the temps are hitting the mid 70's and then once I find something promising load up 50-100 to test as it heats up for summer. I get out and shoot a few here and there as the summer goes along to make sure the group has stayed together and the velocity hasn't jumped. If things hold pretty close then I don't mind using them during hunting season. But as the temp drops even further I use the tried and true loads, or simply use something else, until I can verify the new load.
While things did work out for me that one day, I do not usually carry two rifles to the stand, and had it been the huge ol buck we were actually chasing, I would have been severely disappointed in the results of that load.
Good luck and don't give it up till you test it out. Maybe give the cooler full of ice a try.
I like to work things up in the spring just as the temps are hitting the mid 70's and then once I find something promising load up 50-100 to test as it heats up for summer. I get out and shoot a few here and there as the summer goes along to make sure the group has stayed together and the velocity hasn't jumped. If things hold pretty close then I don't mind using them during hunting season. But as the temp drops even further I use the tried and true loads, or simply use something else, until I can verify the new load.
While things did work out for me that one day, I do not usually carry two rifles to the stand, and had it been the huge ol buck we were actually chasing, I would have been severely disappointed in the results of that load.
Good luck and don't give it up till you test it out. Maybe give the cooler full of ice a try.
FrankenMauser
New member
I did an extensive load development test cycle for 140 gr Partitions and various powders in .270 Win, from sub-zero temperatures to 106+ F, over the course of several years.
Many powders (always the same lot) performed wildly differently at the extremes.
Some were fairly sedate, but still veered from the predicted path.
Surprisingly, some of the powders "known far and wide" for being 'temperature sensitive' performed the best for me.
In the end, I settled on Reloder 19 (a "very temperature sensitive" powder
), a 'low' charge weight, and a standard primer, as it gave 'exactly' the same performance (within 0.100"), from below freezing to 'scorching desert plains in August'.
Though velocity is low for a .270 Win, at 2,790 fps, I'd rather have a predictable, precise load, than a higher velocity load that can't be trusted.
Summary:
You will need to, at the very least, test the loads again in cold weather.
It's entirely plausible that you'll have to adjust the load to compensate.
With .458 SOCOM, I had three loads for 325 gr FTXs with Lil Gun.
There was the 'winter load' at max established charge weight.
There was the 'summer load' at 1/2 grain lower than the winter load.
And there was an 'intermediate' load that ran 0.2 gr hotter than the 'summer' load.
Many powders (always the same lot) performed wildly differently at the extremes.
Some were fairly sedate, but still veered from the predicted path.
Surprisingly, some of the powders "known far and wide" for being 'temperature sensitive' performed the best for me.
In the end, I settled on Reloder 19 (a "very temperature sensitive" powder
), a 'low' charge weight, and a standard primer, as it gave 'exactly' the same performance (within 0.100"), from below freezing to 'scorching desert plains in August'.Though velocity is low for a .270 Win, at 2,790 fps, I'd rather have a predictable, precise load, than a higher velocity load that can't be trusted.
Summary:
You will need to, at the very least, test the loads again in cold weather.
It's entirely plausible that you'll have to adjust the load to compensate.
With .458 SOCOM, I had three loads for 325 gr FTXs with Lil Gun.
There was the 'winter load' at max established charge weight.
There was the 'summer load' at 1/2 grain lower than the winter load.
And there was an 'intermediate' load that ran 0.2 gr hotter than the 'summer' load.