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Long Range Hunting & Shooting
Elevation effects on bullet trajectory
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<blockquote data-quote="oldmossy" data-source="post: 2136637" data-attributes="member: 44047"><p>So I chronoed my rifle after work this morning @ 20 degrees. 2962/2970. My original testing months ago @ 60 degrees was 2932/2948. Not sure how accurate chrono is. But that's what I got. Anyways...</p><p>Took a nap, then went to the range. Now its 34 degrees. Chronoed and shot @ 200yds. Speeds about the same. Fired 2 rounds, which cut holes, But 2" low at 200. Bingo! Theres why my gun was shooting low at 615 last time I thought. Doesn't make up for 1.5 moa, but theres 1 moa of it accounted for. Went from 200 to exactly 600. Shot 3- 2 shot groups with adequate cooling between rounds/groups. All 1/2 moa groups. But 1 moa higher than it should be. Scratching my head, I went back to 200 to check my zero again. Fired 2 shots. 1/2" group. But 2 moa high. </p><p></p><p>So as much as I hate its the scope. Im relieved I found the problem. In this process though, I gained a little more knowledge by researching powder sensativities, rate of twists, and barometric psi effects. So wasn't a total loss. Plus I got a cool watch outta the deal.</p><p></p><p>So to the original poster. Maybe my Rangefinders aren't as bad as I was thinking after all. I be sure to let you know with further testing. I have my notes for cold weather. Just need some warmer days to see results</p></blockquote><p></p>
[QUOTE="oldmossy, post: 2136637, member: 44047"] So I chronoed my rifle after work this morning @ 20 degrees. 2962/2970. My original testing months ago @ 60 degrees was 2932/2948. Not sure how accurate chrono is. But that's what I got. Anyways... Took a nap, then went to the range. Now its 34 degrees. Chronoed and shot @ 200yds. Speeds about the same. Fired 2 rounds, which cut holes, But 2" low at 200. Bingo! Theres why my gun was shooting low at 615 last time I thought. Doesn't make up for 1.5 moa, but theres 1 moa of it accounted for. Went from 200 to exactly 600. Shot 3- 2 shot groups with adequate cooling between rounds/groups. All 1/2 moa groups. But 1 moa higher than it should be. Scratching my head, I went back to 200 to check my zero again. Fired 2 shots. 1/2" group. But 2 moa high. So as much as I hate its the scope. Im relieved I found the problem. In this process though, I gained a little more knowledge by researching powder sensativities, rate of twists, and barometric psi effects. So wasn't a total loss. Plus I got a cool watch outta the deal. So to the original poster. Maybe my Rangefinders aren't as bad as I was thinking after all. I be sure to let you know with further testing. I have my notes for cold weather. Just need some warmer days to see results [/QUOTE]
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