what case/powder/caliber/bullet for temperature variances

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What case/caliber/ powder will give me the best results for coyote and target with extreem temperature variations, that would require the least amount of adjustemts and problems. Our temps here range from 90 degrees to 20 below zero. Or is it an idividual gun characteristic? thanks.. dave
 
A .22-250 loaded with RL-15, or a .223 with H4895 will probably be your best bet. Of the two I would choose the .22-250 because of the ranges you will be shooting while hunting, and the extra speed will be better in the wind.

RL-15 is very temp insensitive, but it will still probably change over that much of a spread. If you shoot it enough you can develop a cold weather load using the same powder. The 50gr Nosler BT is very accurate and would fit both of your needs.

Good Luck!
 
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That's a really, really wide extreme to try to accomodate. Since it's not the air temperature that affects external ballistics I'd make more effort toward maintaining a fairly constant ammunition temperature.

IMHO, there is no good/better/best combination of case/caliber/powder. They will all react to temperature ranges of 110 degrees, some maybe more than others, but you will wear out your barrel trying to find the right combination.

JMHO

Ray
 
At a quick glance

I wouldn't say I could agree with that chart. It shows a 308- 110 g bullet dropping about 7" @ 300 with a 200 zero. I don't experience anything close to that. More like 4" or a bit less with a 115g bullet even starting off @ a slightly slower speed. I guess it could be ta difference in the bullets . I don't understand the code for the bullet used.
 
actually the problem im refering to is loss of velocity, or pressure, not in the sence that i can adjust for drop in different conditions, but loss of accuracy due to pressure drop.. I had a 22 250 that shot wonderfully, and sold it becouse my 6mm was so much better in the wind.. now im really sorry i sold it becouse i could have different guns for different temp ranges. dave.
 
I'm sorry. There are no magical cartridges or powders that will maintain a certain pressure in 100+ degree temp changes. Not even 50 degrees for that matter.

THe bottom line is if you're going to shoot all 4 seasons, you must have at least two different loads. One for winter and one for summer. It's not that difficult to master. Just take good notes while chronographing and you'll figure out what you've got to do. It's usually a change in powder charge of anywhere between a grain and two grains.
 
While I agree with much of whats already been said, I do also believe that some cartridges are much more forgiving than others. The 30BR is the most forgiving of any cartridge I've ever played with. The 22-250 is not even close. If I were going to build a rifle for the purposes you've outlined, it would be a slow twist 30BR, unless you plan on shooting past 500 yards.
 
Hal D. said:
While I agree with much of whats already been said, I do also believe that some cartridges are much more forgiving than others. The 30BR is the most forgiving of any cartridge I've ever played with. The 22-250 is not even close. If I were going to build a rifle for the purposes you've outlined, it would be a slow twist 30BR, unless you plan on shooting past 500 yards.
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I agree tentatively with Hal D's thinking but I'll disagree with the choice of the 30BR........ I think that a plain-jane .308Win is a better choice. I think that the key here is the fact that the cartridge case is balanced as far as capacity/bore ration goes AND it's not necked down so far as a .22 or a 6mm which masks pressure variances. Maybe the 30X47 which falls between the two is even better but I have a hunch that one would run into ignition problems in cold weather.

Yup, I'll cast a vote for the proven 7.62 NATO round :)

110's will make it shoot like a 22-250 and 200's will make it hit like a cudgel. Match bullets on both ends of the spectrum will allow you to compete from 100 to 1000yds.

I can't picture a more versatile do-all round.

opinionsby


;)


al
 
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