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Rifles, Reloading, Optics, Equipment
Reloading
.270 velocity variations
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<blockquote data-quote="nheninge" data-source="post: 337325" data-attributes="member: 13085"><p>Neck turning is a bit of a stretch, but I found that with necks turned to the same thickness, I was able to achieve the same neck tension on each bullet and I felt like the velocities seemed to be more consistent. To clarify, this was by neck sizing only without an expander ball on unturned brass. Probably related to different chamber pressures in the bullets with thicker necks and tighter neck tension??? This may or likely may not apply to you and also would only be responsible for small variation not 100fps variation as you describe. </p><p></p><p>I have asked about chrony verification in the past with not much help. The only thing you can do is set two different models end to end and shoot over each (at the same time) to see how close the readings are with each shot. This gives you relative data (not absolute), but I haven't heard of a place to send in your chrony to have it validated. Don't really need to worry about this if your drop data matches your chrony's numbers. Sometimes the light here in New Mexico plays heck with my chrony. 100 fps might mean a difference in 20-30 inches at 1000 yards. If you are truly getting that variation it would certainly be evident at long ranges. Probably barely detectable at 100 yards?</p><p></p><p>Lucky you on the primers! Hope to see an end to this shortage soon.</p></blockquote><p></p>
[QUOTE="nheninge, post: 337325, member: 13085"] Neck turning is a bit of a stretch, but I found that with necks turned to the same thickness, I was able to achieve the same neck tension on each bullet and I felt like the velocities seemed to be more consistent. To clarify, this was by neck sizing only without an expander ball on unturned brass. Probably related to different chamber pressures in the bullets with thicker necks and tighter neck tension??? This may or likely may not apply to you and also would only be responsible for small variation not 100fps variation as you describe. I have asked about chrony verification in the past with not much help. The only thing you can do is set two different models end to end and shoot over each (at the same time) to see how close the readings are with each shot. This gives you relative data (not absolute), but I haven't heard of a place to send in your chrony to have it validated. Don't really need to worry about this if your drop data matches your chrony's numbers. Sometimes the light here in New Mexico plays heck with my chrony. 100 fps might mean a difference in 20-30 inches at 1000 yards. If you are truly getting that variation it would certainly be evident at long ranges. Probably barely detectable at 100 yards? Lucky you on the primers! Hope to see an end to this shortage soon. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
.270 velocity variations
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