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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 rum standard deviation,HELP
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<blockquote data-quote="LongBomber" data-source="post: 412462" data-attributes="member: 14435"><p>What are your groups like out at 300-400 yards. Shoot it and see what the vertical group size is. There are many things that can a do go wrong with chrony's all the time. 45fps is quite a bit of velocity change, especially if you are trying to go out to 1000. FWIW I load 95gr retumbo behind a 200gr partition with CCI primers in Nosler brass, this load holds under 0.3moa vertical.</p><p> </p><p>Is there any reloading steps that could be giving you this variation? Are you using a good digital scale? Varying powder charges will contribute to velocity differences. </p><p> </p><p>Shoot at 300 yards and try and get your loads to group under half MOA for vertical size. Try going up and down in .2gr increments, and you will find the sweet spot.</p></blockquote><p></p>
[QUOTE="LongBomber, post: 412462, member: 14435"] What are your groups like out at 300-400 yards. Shoot it and see what the vertical group size is. There are many things that can a do go wrong with chrony's all the time. 45fps is quite a bit of velocity change, especially if you are trying to go out to 1000. FWIW I load 95gr retumbo behind a 200gr partition with CCI primers in Nosler brass, this load holds under 0.3moa vertical. Is there any reloading steps that could be giving you this variation? Are you using a good digital scale? Varying powder charges will contribute to velocity differences. Shoot at 300 yards and try and get your loads to group under half MOA for vertical size. Try going up and down in .2gr increments, and you will find the sweet spot. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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300 rum standard deviation,HELP
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