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Rifles, Reloading, Optics, Equipment
Reloading
Help with velocity variance
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<blockquote data-quote="WRG" data-source="post: 454038" data-attributes="member: 13638"><p>It has been my experience that searching for the lowest SD has no correlation to accuracy. I have had loads with as much a 50 fps out perform loads I have that run in the low teens. I use to spend more time trying to tune my loads to have the smallest SD, some are under 5 fps and are no better. If you can get away with just neck sizing that 300 mag, I would suggest measuring a fired form case for volume "H20" with the bullet seated where you think is a good place to start. Then worry about trying to get the best case fill that will give you the desired velocity your looking for. As long as you understand what the harmonic nodes / barrel timing are for that barrel you should have a target velocity in mind. You can do the same if you have to FL size also but I prefer to neck size as long as I can get away with it in my 300WM. Sure having a low SD with a super accurate load is great however you could end up beating your head silly trying, especially in that 300WM.</p><p> </p><p>oh, foregot, most chronographs should be at least 8'-10' from the barrel. You are most likely getting interferance from the muzzle blast at 5'. Try moving it out further.</p><p> </p><p>IMAO!</p></blockquote><p></p>
[QUOTE="WRG, post: 454038, member: 13638"] It has been my experience that searching for the lowest SD has no correlation to accuracy. I have had loads with as much a 50 fps out perform loads I have that run in the low teens. I use to spend more time trying to tune my loads to have the smallest SD, some are under 5 fps and are no better. If you can get away with just neck sizing that 300 mag, I would suggest measuring a fired form case for volume "H20" with the bullet seated where you think is a good place to start. Then worry about trying to get the best case fill that will give you the desired velocity your looking for. As long as you understand what the harmonic nodes / barrel timing are for that barrel you should have a target velocity in mind. You can do the same if you have to FL size also but I prefer to neck size as long as I can get away with it in my 300WM. Sure having a low SD with a super accurate load is great however you could end up beating your head silly trying, especially in that 300WM. oh, foregot, most chronographs should be at least 8'-10' from the barrel. You are most likely getting interferance from the muzzle blast at 5'. Try moving it out further. IMAO! [/QUOTE]
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Reloading
Help with velocity variance
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