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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Velocity swings
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<blockquote data-quote="shortpants" data-source="post: 482528" data-attributes="member: 30564"><p>I was testing a few different factory loads. Two weeks ago I fired just a couple of rounds of each just to get a rough estimate of velocity so I could compare them on a calculator. I went back out Monday and the first thing I noticed was the HSM VLD's were reading over 100 ft. per sec. faster than 2 weeks ago. LIGHTING CONDITIONS WERE THE SAME AND CHRONY WAS UNDER SHADE THE ENTIRE TIME. Then when I went to test the E-TIP's they started out the same as 2 weeks ago (3150fps.) but I had 1 shot that read 3277fps!!! The next shot was back down around 3180??? I realize the 3277 might have been something weird with the chrony but do you think premium factory ammo will differ that much? If I wasn't getting such fast velocities out of these I'd be quick to toss them out but the ballistics are amazing out of a factory round if they are in fact more consistant than the readings. I know what your going to say try a different chrony and shoot some more. I'm going to do just that but in the mean time just thought I'd see what you guys think? After the E-TIP's I tested the Remington Scirrocco's and the velocity swings were less than 30fps. Can the chrony be accurate 1 minute and not the next when the lighting is the same? If the E-TIP's turn out to be inconsistant then I'll toss 'em but it sure would be nice to get 3150fps out of a factory 180gr. 300wsm!</p></blockquote><p></p>
[QUOTE="shortpants, post: 482528, member: 30564"] I was testing a few different factory loads. Two weeks ago I fired just a couple of rounds of each just to get a rough estimate of velocity so I could compare them on a calculator. I went back out Monday and the first thing I noticed was the HSM VLD's were reading over 100 ft. per sec. faster than 2 weeks ago. LIGHTING CONDITIONS WERE THE SAME AND CHRONY WAS UNDER SHADE THE ENTIRE TIME. Then when I went to test the E-TIP's they started out the same as 2 weeks ago (3150fps.) but I had 1 shot that read 3277fps!!! The next shot was back down around 3180??? I realize the 3277 might have been something weird with the chrony but do you think premium factory ammo will differ that much? If I wasn't getting such fast velocities out of these I'd be quick to toss them out but the ballistics are amazing out of a factory round if they are in fact more consistant than the readings. I know what your going to say try a different chrony and shoot some more. I'm going to do just that but in the mean time just thought I'd see what you guys think? After the E-TIP's I tested the Remington Scirrocco's and the velocity swings were less than 30fps. Can the chrony be accurate 1 minute and not the next when the lighting is the same? If the E-TIP's turn out to be inconsistant then I'll toss 'em but it sure would be nice to get 3150fps out of a factory 180gr. 300wsm! [/QUOTE]
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