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Rifles, Reloading, Optics, Equipment
Reloading
How critical is measuring powder to .01 grains
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<blockquote data-quote="Teri Anne" data-source="post: 2784969" data-attributes="member: 118816"><p>Been reloading for a long time and in the grand scheme of things 1/10th of a grain might not mean that much at 1000 yards, I pretty much only shoot out to 600 where it doesn't seem to make a difference, but as a matter of course I do weigh all charges going into rifle cartridges to the exact charge. Pistol ammo once the charge is set I only drop the charges checking every 10 or so to make sure that the charge weight has not changed. Why the difference? Primarily because at the distances one is shooting a pistol and the variations with the hold and sight alignment 1/10 gr, even at 50 yards will not make a significant difference in the flight path of the bullet, but the shooters position, sight alignment even with a scope or dot will not be so steady as to compare with a long range rifle shot off of a bench. </p><p></p><p>Now let's throw a monkey wrench into the calculations. When we do a ladder to check the accuracy we do our variations in either 1/10th or 2/10 grain intervals. This is done to find the ultimate combination of powder vs bullet that shoots the best out of our rifles. If our rifle, as an example my 308 loads absolutely love 40.5 grains of IMR4320 and 165 or 168 gr bullets. They both shoot sub MOA with this load and are good on targets out to 600 yards. If I vary the charge by 1/10th of a grain the groups open up and may exceed 1 MOA. With IMR4320 out of production I am going to work up another load, most likely IMR4350 but that is yet to be seen. </p><p></p><p>In the end it is all up to you and your rifle. If you take the time to work up a ladder for the rifle then it should be worth your time to measure out each cartridge to obtain the best accuracy for your rifle. If you get lazy and only throw the powder and allow variances then expect the groups to suffer.</p></blockquote><p></p>
[QUOTE="Teri Anne, post: 2784969, member: 118816"] Been reloading for a long time and in the grand scheme of things 1/10th of a grain might not mean that much at 1000 yards, I pretty much only shoot out to 600 where it doesn't seem to make a difference, but as a matter of course I do weigh all charges going into rifle cartridges to the exact charge. Pistol ammo once the charge is set I only drop the charges checking every 10 or so to make sure that the charge weight has not changed. Why the difference? Primarily because at the distances one is shooting a pistol and the variations with the hold and sight alignment 1/10 gr, even at 50 yards will not make a significant difference in the flight path of the bullet, but the shooters position, sight alignment even with a scope or dot will not be so steady as to compare with a long range rifle shot off of a bench. Now let's throw a monkey wrench into the calculations. When we do a ladder to check the accuracy we do our variations in either 1/10th or 2/10 grain intervals. This is done to find the ultimate combination of powder vs bullet that shoots the best out of our rifles. If our rifle, as an example my 308 loads absolutely love 40.5 grains of IMR4320 and 165 or 168 gr bullets. They both shoot sub MOA with this load and are good on targets out to 600 yards. If I vary the charge by 1/10th of a grain the groups open up and may exceed 1 MOA. With IMR4320 out of production I am going to work up another load, most likely IMR4350 but that is yet to be seen. In the end it is all up to you and your rifle. If you take the time to work up a ladder for the rifle then it should be worth your time to measure out each cartridge to obtain the best accuracy for your rifle. If you get lazy and only throw the powder and allow variances then expect the groups to suffer. [/QUOTE]
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How critical is measuring powder to .01 grains
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