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Rifles, Reloading, Optics, Equipment
Reloading
How "important" are certain details when reloading?
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<blockquote data-quote="Bart B" data-source="post: 836329" data-attributes="member: 5302"><p>In my experience and observations shooting matches and winning a few as well as noting what others do, my list of "important details" listed in order are as follows for developing a load for a given rifle:</p><p></p><p>1. Bullets must be a few to several ten-thousandths inch larger than groove diameter and be well balanced; i.e. true match grade with a good track record.</p><p></p><p>2. Powder choice has to produce uniform pressure curve shapes; medium speed ones for the cartridge seem to work best.</p><p></p><p>3. Primer must uniformly ignite the powder such that it burns the same from shot to shot; milder ones oft times do this better than hotter ones.</p><p></p><p>4. Case must fit the chamber such that no binding of the bolt happens when the round's loaded. 1/1000ths inch of head clearance is good enough.</p><p></p><p>5. Case neck has to have less than 1/1000th inch spread in thickness and be well centered on bottleneck case shoulders on those headspacing on their shoulder; new cases shoot 95% as accurate as fired ones in this regard. Note: bottleneck cases headspacing on their shoulder center up front in the chamber at the shoulder by in-line ejectors and firing pins pushing them there; doesn't matter how much clearance their is between the case body and chamber wall.</p><p></p><p>6. Bullet runout less than 1% of bullet diameter; seating them so they gently jam into the lands helps with some, others need a few thousandths jump.</p><p></p><p>7. Case weight spread of 1% is plenty good enough.</p><p></p><p>8. Powder charge weight spread can be as much as 2/10ths or 3/10ths grain and with the right powder and weight for the bullet, sub 1 MOA accuracy at 1000 yards at worst is easily attainable. Some lots of ammo with a 3/10ths grain spread about 45 grains have shot 1/2 MOA or better at worst 600 yards down range.</p><p></p><p>9. Case neck tension spread should be 20% about a 5 to 10 pound extraction force.</p><p></p><p>There's been dozens of thousands of rounds commercially loaded oh high speed machines for competition with brand new cases with a 3% spread in case weight and metered powder charges that shot 1/2 to 2/3 MOA at 600 yards in all sorts of barrels in different rifles. Given that, if you can handload ammo yourself, you can do that well easily. Just use the right tools the right way with the right components.</p></blockquote><p></p>
[QUOTE="Bart B, post: 836329, member: 5302"] In my experience and observations shooting matches and winning a few as well as noting what others do, my list of "important details" listed in order are as follows for developing a load for a given rifle: 1. Bullets must be a few to several ten-thousandths inch larger than groove diameter and be well balanced; i.e. true match grade with a good track record. 2. Powder choice has to produce uniform pressure curve shapes; medium speed ones for the cartridge seem to work best. 3. Primer must uniformly ignite the powder such that it burns the same from shot to shot; milder ones oft times do this better than hotter ones. 4. Case must fit the chamber such that no binding of the bolt happens when the round's loaded. 1/1000ths inch of head clearance is good enough. 5. Case neck has to have less than 1/1000th inch spread in thickness and be well centered on bottleneck case shoulders on those headspacing on their shoulder; new cases shoot 95% as accurate as fired ones in this regard. Note: bottleneck cases headspacing on their shoulder center up front in the chamber at the shoulder by in-line ejectors and firing pins pushing them there; doesn't matter how much clearance their is between the case body and chamber wall. 6. Bullet runout less than 1% of bullet diameter; seating them so they gently jam into the lands helps with some, others need a few thousandths jump. 7. Case weight spread of 1% is plenty good enough. 8. Powder charge weight spread can be as much as 2/10ths or 3/10ths grain and with the right powder and weight for the bullet, sub 1 MOA accuracy at 1000 yards at worst is easily attainable. Some lots of ammo with a 3/10ths grain spread about 45 grains have shot 1/2 MOA or better at worst 600 yards down range. 9. Case neck tension spread should be 20% about a 5 to 10 pound extraction force. There's been dozens of thousands of rounds commercially loaded oh high speed machines for competition with brand new cases with a 3% spread in case weight and metered powder charges that shot 1/2 to 2/3 MOA at 600 yards in all sorts of barrels in different rifles. Given that, if you can handload ammo yourself, you can do that well easily. Just use the right tools the right way with the right components. [/QUOTE]
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Reloading
How "important" are certain details when reloading?
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