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Rifles, Reloading, Optics, Equipment
Reloading
Flash Hole uniforming
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<blockquote data-quote="nicholasjohn" data-source="post: 1823738" data-attributes="member: 109113"><p>That's an interesting concept, and I must admit that I hadn't thought of it. I would expect that this would also contribute to lower SD's - have you found that to be the case ??? Years ago, I was using an old Shooting Chrony, which didn't calculate standard deviation. I do remember, though, that I got noticeably lower extremes spreads in my velocities when I de-burred the flash holes. I also uniform the primer pockets, but since I started doing both of these operations at the same time, I don't know if one or the other was responsible for the improved results. The most important improvement in the results was the size of the groups - they shrunk noticeably in size. If the SD's and ES's are also lower, I would expect the smaller group size to hold up out there at long range.</p></blockquote><p></p>
[QUOTE="nicholasjohn, post: 1823738, member: 109113"] That's an interesting concept, and I must admit that I hadn't thought of it. I would expect that this would also contribute to lower SD's - have you found that to be the case ??? Years ago, I was using an old Shooting Chrony, which didn't calculate standard deviation. I do remember, though, that I got noticeably lower extremes spreads in my velocities when I de-burred the flash holes. I also uniform the primer pockets, but since I started doing both of these operations at the same time, I don't know if one or the other was responsible for the improved results. The most important improvement in the results was the size of the groups - they shrunk noticeably in size. If the SD's and ES's are also lower, I would expect the smaller group size to hold up out there at long range. [/QUOTE]
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Flash Hole uniforming
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