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Rifles, Reloading, Optics, Equipment
Reloading
Same handload different grouping issue
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<blockquote data-quote="Rhett Crider" data-source="post: 1505085" data-attributes="member: 105034"><p>As your barrel breaks in, your muzzle velocity increases therefore your node(harmonic vibration) will be closer to the muzzle rather than the receiver. The lighter contour barrels(such as sporters) will exaggerate this more than a heavy contour(#4-up). Usually you need to back down on your powder and it doesn't take much. I would reduce by 0.1, 0.2, and 0.3 grains x 5 cartridges each then see which one groups. It appears from your first post that you were zeroing at either 100 or 200 yds.. Also chrono your loads so you know where the sweet spot is w/ the powder/bullet you are using. This is what I do and it works for me. There are several posts on this and other forums that discuss barrel speed during break in. You would be amazed at how much it increases from shot to shot getting there.</p></blockquote><p></p>
[QUOTE="Rhett Crider, post: 1505085, member: 105034"] As your barrel breaks in, your muzzle velocity increases therefore your node(harmonic vibration) will be closer to the muzzle rather than the receiver. The lighter contour barrels(such as sporters) will exaggerate this more than a heavy contour(#4-up). Usually you need to back down on your powder and it doesn't take much. I would reduce by 0.1, 0.2, and 0.3 grains x 5 cartridges each then see which one groups. It appears from your first post that you were zeroing at either 100 or 200 yds.. Also chrono your loads so you know where the sweet spot is w/ the powder/bullet you are using. This is what I do and it works for me. There are several posts on this and other forums that discuss barrel speed during break in. You would be amazed at how much it increases from shot to shot getting there. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Same handload different grouping issue
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