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Rifles, Reloading, Optics, Equipment
Reloading
Powder Temperature Sensitivity
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<blockquote data-quote="Slim_T" data-source="post: 257067" data-attributes="member: 15132"><p><span style="font-family: 'Arial'"><span style="font-size: 10px">I am also interested in this type of information. I shot a practice F-class match today at Quantico MCB. When we started it was 10 degrees F outside and I left my ammo in the truck. I worked the pits in the early hours and didn't shoot until noon. So my ammo was around 20 degrees F (guessing) when I started. At 1000yds I shot cold ammo and I was darn near hitting the ground in front of the target. I adjusted 3 moa from my ballistic table to get x-ring. We had a 20 min cease fire and I left my ammo and rifle in the sun. The rifle felt nice and warm on a cold day and so did the ammo. My first shot after the cease fire was about 10in high. I adjusted down 1 moa and again started hitting x/10 ring. I do not believe that the wind changed or that I changed my shooting position significantly. So..I believe that the ammo warming up in the sun changed my point of impact 10 inches at 1000yards. My ballistics table was for 35F, but what it did not account for was the reduction in velocity due to the powder temp. I changed the ambient temp in my ballistics program to reflect the 15F difference and the drop was only slightly affected (8 inches). I then adjusted my muzzle velocity down until the 1000 yard drop was about what I had experienced at the start of my 1000yard shooting. The velocity change was 50fps reduced. </span></span></p><p> <span style="font-family: 'Arial'"><span style="font-size: 10px"></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">So..I would like to find out what type of velocity change can occur due to temperature change of the power at the time of ignition.</span></span></p><p> <span style="font-family: 'Arial'"><span style="font-size: 10px"></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">If I cannot find this type of information I will begin to experiment with warm and cold round over a chronograph.</span></span></p><p> <span style="font-family: 'Arial'"><span style="font-size: 10px"></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">Slim</span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px"></span></span></p></blockquote><p></p>
[QUOTE="Slim_T, post: 257067, member: 15132"] [FONT=Arial][SIZE=2]I am also interested in this type of information. I shot a practice F-class match today at Quantico MCB. When we started it was 10 degrees F outside and I left my ammo in the truck. I worked the pits in the early hours and didn't shoot until noon. So my ammo was around 20 degrees F (guessing) when I started. At 1000yds I shot cold ammo and I was darn near hitting the ground in front of the target. I adjusted 3 moa from my ballistic table to get x-ring. We had a 20 min cease fire and I left my ammo and rifle in the sun. The rifle felt nice and warm on a cold day and so did the ammo. My first shot after the cease fire was about 10in high. I adjusted down 1 moa and again started hitting x/10 ring. I do not believe that the wind changed or that I changed my shooting position significantly. So..I believe that the ammo warming up in the sun changed my point of impact 10 inches at 1000yards. My ballistics table was for 35F, but what it did not account for was the reduction in velocity due to the powder temp. I changed the ambient temp in my ballistics program to reflect the 15F difference and the drop was only slightly affected (8 inches). I then adjusted my muzzle velocity down until the 1000 yard drop was about what I had experienced at the start of my 1000yard shooting. The velocity change was 50fps reduced. So..I would like to find out what type of velocity change can occur due to temperature change of the power at the time of ignition. If I cannot find this type of information I will begin to experiment with warm and cold round over a chronograph. Slim [/SIZE][/FONT] [/QUOTE]
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Powder Temperature Sensitivity
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