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Rifles, Reloading, Optics, Equipment
Reloading
Effects of Temperature on Velocity...
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<blockquote data-quote="JEREMY logan" data-source="post: 277700"><p>One year i sighted in my 300rum at (just guessing) 40 degrees. I gathered data starting @ 300 yrds and stopped at 830. Once i had my elevation adjustments written down i could bust a 20 ounce mtn dew bottle at 400 yrds not great but not easy either at 640 yrds i could make dust fly off of a 9'' size rock . Summer came and a friend of mine said he had permission from a farmer to thin out the deer herd because of crop damage, he barely had to twist my arm , i said okay lets go i had my come ups all written down with me i used the same range finder ( leicia 1200 yrd )to range a doe it said 604 yrds same load and bullet the field was a soy bean field the plants were very small so it left alot of dust to see bullet impacts i dialed in for 640 yrds I pulled the trigger and dust flew LOW before the deer i thought what happened? Turned out it was very hot and hummid long story but i believe temp, humidity, elevation all make a big difference ......</p></blockquote><p></p>
[QUOTE="JEREMY logan, post: 277700"] One year i sighted in my 300rum at (just guessing) 40 degrees. I gathered data starting @ 300 yrds and stopped at 830. Once i had my elevation adjustments written down i could bust a 20 ounce mtn dew bottle at 400 yrds not great but not easy either at 640 yrds i could make dust fly off of a 9'' size rock . Summer came and a friend of mine said he had permission from a farmer to thin out the deer herd because of crop damage, he barely had to twist my arm , i said okay lets go i had my come ups all written down with me i used the same range finder ( leicia 1200 yrd )to range a doe it said 604 yrds same load and bullet the field was a soy bean field the plants were very small so it left alot of dust to see bullet impacts i dialed in for 640 yrds I pulled the trigger and dust flew LOW before the deer i thought what happened? Turned out it was very hot and hummid long story but i believe temp, humidity, elevation all make a big difference ...... [/QUOTE]
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Reloading
Effects of Temperature on Velocity...
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