disco stu wrote:Thanks guys.
Waneroo-is that temp sensitivity gong to be less of an issue here seeing we get nowhere near as cold as you, and range from lowest winter to hottest summer temp is nowhere near as large? I also figured I wouldn't be loading up to as hot as I can, so I hope it's not a problem in that way when shooting in summer
I got some 4895 (2206h) also from the same guy. Only 500 grams though so I'll use that for reduced loads I want to play with, and the 1.5kg of 748 for full power loads
disco stu wrote:Ha ha!
There may be places in Australia that have a fair degree of temp variation, but I still think we would be hard pushed to match northern usa and Canada between winter and summer temps.
We stayed at Bracebridge in Canada with in laws, and their previous winter it was -40c. Temp while we were there in summer was about 30c, like our typical summer temp here. I gather they can get a bit higher in summer, maybe 5-10. So temp swing in bracebridge about 75C +, temp swing in places I go is about 40-45c.
I was shocked about the temps they see. I always assumed when younger that everywhere had a similar temp change range, so if they go to negative 20 their maximum would be about +25.
disco stu wrote:I'm guessing probably not there, but not certain.
My original comment was winter to summer for temperature effects with that powder, as in you develop your load when it's like -30 or something stupid, and then shoot it in summer at +20 with rounds sitting in the sun. I see now you're saying variation between sunrise and midday or similar.
disco stu wrote:Thanks guys.
Waneroo-is that temp sensitivity gong to be less of an issue here seeing we get nowhere near as cold as you, and range from lowest winter to hottest summer temp is nowhere near as large? I also figured I wouldn't be loading up to as hot as I can, so I hope it's not a problem in that way when shooting in summer
I got some 4895 (2206h) also from the same guy. Only 500 grams though so I'll use that for reduced loads I want to play with, and the 1.5kg of 748 for full power loads
The US Military used Win 748 for decades in 5.56x45 and also as I understand 7.62 NATO, so if it was good enough for them, it should be good to go. For all I know it might still be used.
I struggle to believe ambient temperature can have any measurable effect compared to the thousands of degrees occurring during combustion.
disco stu wrote:The US Military used Win 748 for decades in 5.56x45 and also as I understand 7.62 NATO, so if it was good enough for them, it should be good to go. For all I know it might still be used.
I thought I read that it was used by military. They're generally picky about that sort of thing, and would have less ability to control temperature when in the field I imagine. Sounds like another internet mythI struggle to believe ambient temperature can have any measurable effect compared to the thousands of degrees occurring during combustion.
Yeah, I think similar to that as it's a miniscule difference % wise, but figure I'm not qualified to say anything either way on it
disco stu wrote:Not to mention, if it was that big an issue I figure there would be warnings everywhere about it and people wouldn't use it any more.
Does this mean that winchester 748 is the tacticool powder?