02-07-2020, 12:49 PM
tdbru Wrote:Second,
great looking rig. and i KNOW you must be from Scandinavia. where it appears a nice winter day is one with ONLY ~1m of snow on the ground. or so it appears. how can you shoot tiny groups when you're shivering? i suppose if you shoot several rounds quickly, you can use the barrel as a hand warmer.... anyway, well done rig. enjoy. i have forgotten, what is the twist rate of the barrel? 1-200mm? i assume very cold air = high atmospheric pressure? very dense air? that would require a faster twist rate than warm, low density air, correct? are you close to sea level? or much higher? just curious about bullet stability of a bullet that is as long as the 140 ELD-M in high air density (sea level, arctic) situations. do you find you need to run faster twist barrels to keep the pointy end going down range this time of year?
congratulations!
-tdbru
After that picture was taken, we got another 50cm of snow. The range is for the time beeing closed until we get is cleared with a big tractor.
Have no problem shooting in the cold. I'm physically like a bear so I don't shiver.
But tiny groups is another problem. To much time behind the loadbench and not enough time behind the rifle.
The twist rate of the Kriger-barrel is 1:8. On the shorter Jury-barrel it's 1:7.5. Not sore how to convert it into metric.
The cold air changes a lot here. It can be +5C and the next weekend it's -25C.
I have extremely small knowledge when it comes to different hPa and air density, meters over the sea etc. And haven't really tested the effect. The shooting range that we can use up to 300meters is at 300meters from sea level. Have often noticed a hPa of around 960 up to about 1030.
But haven't found any indication for stability problems in any of the bullets from 108gr up to 140gr.