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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Chronograph Procedure — Help?
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<blockquote data-quote="Brydawg512" data-source="post: 2953870" data-attributes="member: 107792"><p>Hello, </p><p></p><p>I am trying to trace down a potential issue experienced today with my Magnetospeed Sporter chronograph. </p><p></p><p>As background - new custom rifle. It's a 300 WM with 26" barrel. I had the builder develop a load using 215 Berger Hybrids. </p><p></p><p>The builder chrono'ed 3 shots, with a High of 2945 FPS and Low of 2937. </p><p>So, I chrono'ed today, after shooting approximately 14 rounds, gun was warm and I didn't allow for cooling time, as I probably should have. </p><p></p><p>Here were my results from my 5 chrono'ed shots: </p><p>1: 2861</p><p>2: 2857</p><p>3: 2846</p><p>4: 2871</p><p>5: 2826</p><p></p><p>My questions: </p><p>1) Would a heated up gun cause this drastic different in MV, ES and SD? </p><p></p><p>2) Should I re-chrono with a cold rifle? </p><p></p><p>3) Is it possibly the chronograph? </p><p></p><p>I am not a highly skilled shooter by any means, but my 5 shot group at 100 yards was 3/4", if that add any value to the discussion. </p><p></p><p>Thank you.</p></blockquote><p></p>
[QUOTE="Brydawg512, post: 2953870, member: 107792"] Hello, I am trying to trace down a potential issue experienced today with my Magnetospeed Sporter chronograph. As background - new custom rifle. It’s a 300 WM with 26” barrel. I had the builder develop a load using 215 Berger Hybrids. The builder chrono’ed 3 shots, with a High of 2945 FPS and Low of 2937. So, I chrono’ed today, after shooting approximately 14 rounds, gun was warm and I didn’t allow for cooling time, as I probably should have. Here were my results from my 5 chrono’ed shots: 1: 2861 2: 2857 3: 2846 4: 2871 5: 2826 My questions: 1) Would a heated up gun cause this drastic different in MV, ES and SD? 2) Should I re-chrono with a cold rifle? 3) Is it possibly the chronograph? I am not a highly skilled shooter by any means, but my 5 shot group at 100 yards was 3/4”, if that add any value to the discussion. Thank you. [/QUOTE]
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Chronograph Procedure — Help?
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