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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Velocity swings
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<blockquote data-quote="Michael Eichele" data-source="post: 481515" data-attributes="member: 1007"><p>You will get many answers here. My opinion is that for UPTO 600 yards 30FPS is acceptable IF the load to barrel harmonics are working well together. Harmonics will definately play into where your bullets will land on the target even with fairly hefty velocity differences. This does however have it's limits. For 600 yards you might not see any difference. 800 will still group fair and at 1K 30 FPS will be quite noticable. With good harmonics, you can shoot very tight at 600 yards even with 25-30 FPS extreme spreads. </p><p></p><p>A quick look at a ballistic calculator will show you how much 25-30 FPS will wreak havoc on your 1k groups. The paper targets will verify this as well.</p><p></p><p>I am spoiled with the Edge. I get about 8-12 FPS extreme spreads regularly where my 308 loads are all over the place. Anywhere from single digits to 30 FPS. At the lower 308 velocities.</p><p></p><p>Inconsistent neck tension, varrying neck hardnesses, charge consistency, charge to primer relationship, rifle/burn rate/charge relationship, case volume, ogive to base differences, primer flash hole uniformity all among other things will play into extreme spreads.</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 481515, member: 1007"] You will get many answers here. My opinion is that for UPTO 600 yards 30FPS is acceptable IF the load to barrel harmonics are working well together. Harmonics will definately play into where your bullets will land on the target even with fairly hefty velocity differences. This does however have it's limits. For 600 yards you might not see any difference. 800 will still group fair and at 1K 30 FPS will be quite noticable. With good harmonics, you can shoot very tight at 600 yards even with 25-30 FPS extreme spreads. A quick look at a ballistic calculator will show you how much 25-30 FPS will wreak havoc on your 1k groups. The paper targets will verify this as well. I am spoiled with the Edge. I get about 8-12 FPS extreme spreads regularly where my 308 loads are all over the place. Anywhere from single digits to 30 FPS. At the lower 308 velocities. Inconsistent neck tension, varrying neck hardnesses, charge consistency, charge to primer relationship, rifle/burn rate/charge relationship, case volume, ogive to base differences, primer flash hole uniformity all among other things will play into extreme spreads. [/QUOTE]
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