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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
enviromental effects on trajectory
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<blockquote data-quote="Frank in the Laurel Mts" data-source="post: 22559" data-attributes="member: 87"><p>I agree with Mr Cassel...Being involved with benchrest shooting out to 500 yards I have found that on humid days or cold air (above 65%)my little 67.2 grain bullets will drop an extra 2.5 inches at 500 yards..the same drop also with a frontal wind...on dry days or warm days or going with the wind, they will rise 2.5 inches at 500 yards...the problems occur when I get a combination of problems...cold/dry air or warm/humid air..then you start to add and subtract problems..it drives you crazy! In our form of shooting we have NO SIGHTERS and one shot out of the scoring ring at 500 yards will usually end your day and your chances. I compete in the Long Range Groundhog Matches 100-300-500 yards, no sight-in -- As far as powder changes, stay away from BALL powders, in my experience they are affected the most by weather changes...I use Vitt powders now and also H-extremes and haven't had much of a problem since leaving all ball powders. One other point that you should consider is if you are shooting coated or uncoated bullets... I've had in MY RIFLES better groups and consistency with moly coated bullets at 500 yards and I've noticed they drop less//when compared to the same bullets uncoated//everything else staying the same...I've read lots on this topic and it seems that some people think that it"s because of the edge on the rifling marks on the bullets having less nicks and bumps on them as a results of the molly coating touching the rifling...who knows for sure..they work for me, don't see them used much at the 1000 shoots but they are used at the long range groundhog matches..most of our calibers are below .308 diameters...a few 6.5's, most are variations of the .243's and .224's..this may have something to do with molly use... But Darryl is correct on his comments about environmental effects on bullet performance.. Frank</p></blockquote><p></p>
[QUOTE="Frank in the Laurel Mts, post: 22559, member: 87"] I agree with Mr Cassel...Being involved with benchrest shooting out to 500 yards I have found that on humid days or cold air (above 65%)my little 67.2 grain bullets will drop an extra 2.5 inches at 500 yards..the same drop also with a frontal wind...on dry days or warm days or going with the wind, they will rise 2.5 inches at 500 yards...the problems occur when I get a combination of problems...cold/dry air or warm/humid air..then you start to add and subtract problems..it drives you crazy! In our form of shooting we have NO SIGHTERS and one shot out of the scoring ring at 500 yards will usually end your day and your chances. I compete in the Long Range Groundhog Matches 100-300-500 yards, no sight-in -- As far as powder changes, stay away from BALL powders, in my experience they are affected the most by weather changes...I use Vitt powders now and also H-extremes and haven't had much of a problem since leaving all ball powders. One other point that you should consider is if you are shooting coated or uncoated bullets... I've had in MY RIFLES better groups and consistency with moly coated bullets at 500 yards and I've noticed they drop less//when compared to the same bullets uncoated//everything else staying the same...I've read lots on this topic and it seems that some people think that it"s because of the edge on the rifling marks on the bullets having less nicks and bumps on them as a results of the molly coating touching the rifling...who knows for sure..they work for me, don't see them used much at the 1000 shoots but they are used at the long range groundhog matches..most of our calibers are below .308 diameters...a few 6.5's, most are variations of the .243's and .224's..this may have something to do with molly use... But Darryl is correct on his comments about environmental effects on bullet performance.. Frank [/QUOTE]
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enviromental effects on trajectory
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