testing at 50*
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Dont wate your time..
At Pella circa April 2004:
I tuned my 7MM Boo Boo with RL 22 at home in NE MN in 40-50 temps a day or two before the weekend. Pre-loaded for the match and hoped for the best.
Warm front came through Iowa and it was 80+ in Pella.
First relay sticky bolt and wrecked brass.
I put the ammo boxes in ice water in a cooler to make it through the rest of the relays. It helped survive the weekend but I don't recall winning anything.
I tuned my 7MM Boo Boo with RL 22 at home in NE MN in 40-50 temps a day or two before the weekend. Pre-loaded for the match and hoped for the best.
Warm front came through Iowa and it was 80+ in Pella.
First relay sticky bolt and wrecked brass.
I put the ammo boxes in ice water in a cooler to make it through the rest of the relays. It helped survive the weekend but I don't recall winning anything.
If nothing else, you'll get to find out if Varget really is less temperature sensitive than the others.
And as an aside tip, when you want the degree symbol, there is a shortcut to the ASCII code characters that will get you there. I spent my career in the pharmaceutical industry, and used these with regularity. Instead of 50*, which works, and we get it, but you can say 50° by using the code. Hold down the Alt key, and while holding it, type 0176, then when you release the Alt key, the little ° appears.
Tons more ASCII code shortcuts if you look them up.
And as an aside tip, when you want the degree symbol, there is a shortcut to the ASCII code characters that will get you there. I spent my career in the pharmaceutical industry, and used these with regularity. Instead of 50*, which works, and we get it, but you can say 50° by using the code. Hold down the Alt key, and while holding it, type 0176, then when you release the Alt key, the little ° appears.
Tons more ASCII code shortcuts if you look them up.
Here's my experience. Changes in temperature affect POI. For example, going from 50 degrees to 90 degrees, I definitely experience elevation POI changes even using extruded powder which all I use today.
However, fall around here is a good time to do load development. My favorite is overcast days with minimal mirage, little to no wind, and mild temperatures in the high 50's to mid 60's which provides less barrel heating. I think meaningful load data can be gather with the caveat that one needs checks load and POI during seasonal changes. In other words, loads I tested under these conditions held up precision wise in higher and lower temperatures changes in POI no withstanding and using exclusively extruded powders.
However, fall around here is a good time to do load development. My favorite is overcast days with minimal mirage, little to no wind, and mild temperatures in the high 50's to mid 60's which provides less barrel heating. I think meaningful load data can be gather with the caveat that one needs checks load and POI during seasonal changes. In other words, loads I tested under these conditions held up precision wise in higher and lower temperatures changes in POI no withstanding and using exclusively extruded powders.
I like your 0176 for the degree symbol cept there ain't no ALT key on my phone and I'd need to tell a grandkid the 0176 code to text them for the code cause my memberer don't work so good anymore .....LOL.
Point well taken!
Lucky Shooter
Gold $$ Contributor
How about a simple "deg" ?
CF Junkie
Gold $$ Contributor
Varget is temperature insensitive. You probably won't notice the change in velocity for a 50 degrees F versus 70 degrees F temperature change.
IMR4064 and Reloader change with temperature at about 1.24 fps per degree F. so you would notice the impact of a 20 degree temperature change. Velocity decreases as temperature drops.
Tools like QuickLOAD let you enter the temperature for temperature sensitive powders and adjusts accordingly because they change significantly. But they recommend you don't attempt to adjust for temperature with temp insensitive powders like Varget.
IMR4064 and Reloader change with temperature at about 1.24 fps per degree F. so you would notice the impact of a 20 degree temperature change. Velocity decreases as temperature drops.
Tools like QuickLOAD let you enter the temperature for temperature sensitive powders and adjusts accordingly because they change significantly. But they recommend you don't attempt to adjust for temperature with temp insensitive powders like Varget.
I test loads in the temps im going to be shooting in. Ive found that my loads shoot slower in colder temps.
probably some powders dont, but mine does.
probably some powders dont, but mine does.
charlie b
Gold $$ Contributor
Just write 50F. I include the F since we have a lot of other countries represented where C is the standard.
Yes, there can be a temp difference. How much depends on the powder. I tend to use ones that do not change much.
Data shows RL15 to be very sensitive to temp, Varget is fairly insensitive.
Yes, there can be a temp difference. How much depends on the powder. I tend to use ones that do not change much.
Data shows RL15 to be very sensitive to temp, Varget is fairly insensitive.
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