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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
velocity vs accuracy in long range shooting
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<blockquote data-quote="Bart B" data-source="post: 680018" data-attributes="member: 5302"><p>Good points.</p><p></p><p>I've tried to get my long range shots off between 10 and 15 seconds of chambering them. If they cook in the chamber longer than 20 to 30 seconds, the hotter powder shoots bullets out faster and they go high. So if the wind's changing and I need to keep up with it on the sights, I'll come down 1/4 MOA for every 30 seconds the round's cooked in the chamber. Works just fine. I've waited as long as 3 minutes and after coming up 5 or 6 clicks, put the next bullet down the middle. Then come back down 4 or 5 clicks and the hotter barrel's now back to shooting about normal for the next shot.</p><p></p><p>Conversely, there's been folks at the High Power Nationals with a match winning record setting score almost finished on the 1000 yard target and a cease fire was called 'cause of boats in the impact area on Lake Erie. If the wait before continuing to fire is longer than a couple minutes, competitors get one sighting shot before shooting the next record shot. A few have got the OK to continue after about a minute and a half wait and their barrel's cooled down enough that the next record shot didn't heat up enough in the chamber to shoot its bullet out as fast as the previous ones. That low velocity shot ends up in the 9 ring at 6-o'clock and they lose the match.</p></blockquote><p></p>
[QUOTE="Bart B, post: 680018, member: 5302"] Good points. I've tried to get my long range shots off between 10 and 15 seconds of chambering them. If they cook in the chamber longer than 20 to 30 seconds, the hotter powder shoots bullets out faster and they go high. So if the wind's changing and I need to keep up with it on the sights, I'll come down 1/4 MOA for every 30 seconds the round's cooked in the chamber. Works just fine. I've waited as long as 3 minutes and after coming up 5 or 6 clicks, put the next bullet down the middle. Then come back down 4 or 5 clicks and the hotter barrel's now back to shooting about normal for the next shot. Conversely, there's been folks at the High Power Nationals with a match winning record setting score almost finished on the 1000 yard target and a cease fire was called 'cause of boats in the impact area on Lake Erie. If the wait before continuing to fire is longer than a couple minutes, competitors get one sighting shot before shooting the next record shot. A few have got the OK to continue after about a minute and a half wait and their barrel's cooled down enough that the next record shot didn't heat up enough in the chamber to shoot its bullet out as fast as the previous ones. That low velocity shot ends up in the 9 ring at 6-o'clock and they lose the match. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
velocity vs accuracy in long range shooting
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