w760 temperature sensative?
- Thread starter kzelmer
- Start date
The point of impact could vary with that large a temperature change. You may be wise to check your cold zero before possiby wounding a noble game animal.
The good news is your pressures and velocity's, if changed, will be less. So a max load in hot conditions will not go over max. in cold.
Have in the past done it the opposite way, worked up a load(not with 760/H414) to max in the winter, only to pull the loads back down to components after experiencing overpressure in the heat.
Also, magnum primers may be called for, ..... have experienced hangfires in deep cold with Ball powders.
The good news is your pressures and velocity's, if changed, will be less. So a max load in hot conditions will not go over max. in cold.
Have in the past done it the opposite way, worked up a load(not with 760/H414) to max in the winter, only to pull the loads back down to components after experiencing overpressure in the heat.
Also, magnum primers may be called for, ..... have experienced hangfires in deep cold with Ball powders.
- Location
- Prince Albert, Sk
I developed my hunting load with 760 at a fairly warm temperature, around 20+C.
The load lost some consistency at cooler temperatures but nothing that would cause a miss on an animal.
I did try to develop a target load with it but found that H4350 was more consistent with temperature variation.
I'd stick with it but just check your POI at cooler temperatures.
Nothing meters like a ball powder out of an electronic dispenser.
The load lost some consistency at cooler temperatures but nothing that would cause a miss on an animal.
I did try to develop a target load with it but found that H4350 was more consistent with temperature variation.
I'd stick with it but just check your POI at cooler temperatures.
Nothing meters like a ball powder out of an electronic dispenser.
Ball powders usually call for Magnum primers, as they are harder to ignite, and if the temps dip into the -15 or colder range, I'd probably try the mag primers. (load a few now if you can , and check if there are pressure signs, or start a couple of grains down, and work back up.
I use H414SL10 in my 6.5x55 summer and winter. I use it with everything from 95 grain bullets to 140 grain bullets.
In all honesty, I have never noticed any difference in pressures or velocity between -30 and +30 temps.
W760, is an almost identical powder to H414SL10. The regular H414 and W760, are virtually the same powder and the loading tables are interchangeable.
As mentioned earlier, magnum primers are the way to go with ball powders, especially the slower ones.
W760, H414 and H414SL10 are some of the most consistent powders on the market. They were the forerunners of the temp resistant powders so popular today.
If you are using magnum primers, I doubt there will be little if any difference in your POI.
That same statement can't be made for other powders though. Be careful. Just remember, a moose can't tell the difference between a bullet traveling 200fps slower or faster when it hits him/her.
Years ago, when estruded stick powders were the norm, and only a few ball powders, like BL-C were available, temperature sensetivity were the norm. It was a real problem but we lived with it and just tended to hold over in the dead of winter. That's all changed now. There reall isn't any need for it with the new powders available. H4831 used to be a real bugaboo in winter. I got into the habit of using magnum primers with all slower powders, I had a lot less temperature issues.
I really hate making up loads for summer and winter use. The summer loads may be safe in winter but the winter loads can have some serious pressure issues in summer.
In all honesty, I have never noticed any difference in pressures or velocity between -30 and +30 temps.
W760, is an almost identical powder to H414SL10. The regular H414 and W760, are virtually the same powder and the loading tables are interchangeable.
As mentioned earlier, magnum primers are the way to go with ball powders, especially the slower ones.
W760, H414 and H414SL10 are some of the most consistent powders on the market. They were the forerunners of the temp resistant powders so popular today.
If you are using magnum primers, I doubt there will be little if any difference in your POI.
That same statement can't be made for other powders though. Be careful. Just remember, a moose can't tell the difference between a bullet traveling 200fps slower or faster when it hits him/her.
Years ago, when estruded stick powders were the norm, and only a few ball powders, like BL-C were available, temperature sensetivity were the norm. It was a real problem but we lived with it and just tended to hold over in the dead of winter. That's all changed now. There reall isn't any need for it with the new powders available. H4831 used to be a real bugaboo in winter. I got into the habit of using magnum primers with all slower powders, I had a lot less temperature issues.
I really hate making up loads for summer and winter use. The summer loads may be safe in winter but the winter loads can have some serious pressure issues in summer.
- Location
- Somewhere on the Hudson Bay Coast
Work up your load when the weather is pleasant, then simply confirm your zero in the cold. I've use 760 down in the low -30s without issue. But I see bearhunter has already passed that along.
