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Rifles, Reloading, Optics, Equipment
Reloading
5 or 3 shot group when determining ES/SD???
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<blockquote data-quote="Bart B" data-source="post: 625767" data-attributes="member: 5302"><p>I guess I don't know what my "node" is. Never did a lot of chronographing to get sub .6 MOA accuracy with 30 caliber magnums at 1000 yards. I just used the same charge weight for IMR4350 I always did, maybe dropping it a grain if pressure signs (more primer cup extruded into bolt face hole around the firing pin) appeard. Only had to do that with my last barrel; the previous 3 shot the same with 66 grains under a Sierra 190. Only did velocity tests with one barrel, none with the other three barrels. They all shot just fantastic. Shot 200 gr. HPMK's in one barrel and just dropped the charge 1 grain; same accuracy but they printed about 1/2 MOA lower requiring a small sight change for zero.</p></blockquote><p></p>
[QUOTE="Bart B, post: 625767, member: 5302"] I guess I don't know what my "node" is. Never did a lot of chronographing to get sub .6 MOA accuracy with 30 caliber magnums at 1000 yards. I just used the same charge weight for IMR4350 I always did, maybe dropping it a grain if pressure signs (more primer cup extruded into bolt face hole around the firing pin) appeard. Only had to do that with my last barrel; the previous 3 shot the same with 66 grains under a Sierra 190. Only did velocity tests with one barrel, none with the other three barrels. They all shot just fantastic. Shot 200 gr. HPMK's in one barrel and just dropped the charge 1 grain; same accuracy but they printed about 1/2 MOA lower requiring a small sight change for zero. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
5 or 3 shot group when determining ES/SD???
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