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Rifles, Reloading, Optics, Equipment
Reloading
Using chronograph data to determine the best load????
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<blockquote data-quote="Bart B" data-source="post: 92788" data-attributes="member: 5302"><p>My recommendation is don't use one. A chrony will tell you which load will make a bullet win the race to the target, but not how close together they'll arrive there. I would not try to get a given velocity. The same handload will produce different velocity in each of several rifles anyway, but can be very, very accurate in all of 'em.</p><p></p><p>Years ago I was part of a group of folks testing handloads for Sierra Bullets' then new 155-gr. 30 caliber Palma bullet. New Winchester cases were primed with Federal 210M primers. We tried several powders and charge weights thrown from measures; not weighed. AA2520 ball powder had the lowest charge weight spread, lowest muzzle velocity spread and lowest chamber pressure spread. AA2520 also produced about the worst accuracy. IMR4895 had a 3/10ths charge weight spread, average muzzle velocity spread and peak pressure. IMR4895 produced the best accuracy; tested at 2.8 inches at 600 yards.</p><p></p><p>The best primer today is probably PMC ones. They don't deteriorate and start producing higher muzzle velocity spreads within a year like the others.</p><p></p><p>Change powder charge weight by no less than half a grain to check a load's accuracy. There's no way to tell if you should increase or decrease the powder charge for best accuracy if you're below maximum.</p><p></p><p>Shoot at least 20 shots per group when you think you've got a good load; anything less isn't reliable enough to be meaningful. </p><p></p><p>Full-length size your cases such that you set the shoulder back a few thousandths of an inch.</p></blockquote><p></p>
[QUOTE="Bart B, post: 92788, member: 5302"] My recommendation is don't use one. A chrony will tell you which load will make a bullet win the race to the target, but not how close together they'll arrive there. I would not try to get a given velocity. The same handload will produce different velocity in each of several rifles anyway, but can be very, very accurate in all of 'em. Years ago I was part of a group of folks testing handloads for Sierra Bullets' then new 155-gr. 30 caliber Palma bullet. New Winchester cases were primed with Federal 210M primers. We tried several powders and charge weights thrown from measures; not weighed. AA2520 ball powder had the lowest charge weight spread, lowest muzzle velocity spread and lowest chamber pressure spread. AA2520 also produced about the worst accuracy. IMR4895 had a 3/10ths charge weight spread, average muzzle velocity spread and peak pressure. IMR4895 produced the best accuracy; tested at 2.8 inches at 600 yards. The best primer today is probably PMC ones. They don't deteriorate and start producing higher muzzle velocity spreads within a year like the others. Change powder charge weight by no less than half a grain to check a load's accuracy. There's no way to tell if you should increase or decrease the powder charge for best accuracy if you're below maximum. Shoot at least 20 shots per group when you think you've got a good load; anything less isn't reliable enough to be meaningful. Full-length size your cases such that you set the shoulder back a few thousandths of an inch. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Using chronograph data to determine the best load????
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