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<blockquote data-quote="7070yshot" data-source="post: 1984428" data-attributes="member: 114427"><p>2 weeks is plenty of time however knowing what bullet you are using the twist of your barrel would make this quicker.</p><p></p><p>process</p><p>1 bullet selected for purpose (Barnes doesn't like to be that close to the lands</p><p>2. Is the bullet weight appropriate for the twist ? Use calculator to determine then check stability factor (Miller formula) to ensure stability above 1.5</p><p>3. Create 12-15 loads with only difference being powder in increments of .3 - ensure cases are as close to the same dimensions and weight as possible - within .4 grains smaller variance the better .1 is perfect </p><p>4. Primer depth at .003</p><p>5. Shoot each round cold bore - very important- ensure you have a good way to measure velocity because that's all we are after here. Labradar is the best.</p><p>Record each cold bore shot and make graph looking for widest plateaus if velocity. What I mean is, you will see steady increases in velocity as the powder volume increases- at some point- sometimes 2 areas where the velocity will have much smaller increases or even stay the same. That is your accuracy node. Keep going until you see signs of pressure, sticky bolt, flattened primers, etc, if you never reach signs of pressure then you haven't gone far enough IMO. You know your rifle and your tolerance for risk so do what you want- certainly not advising you to do anything dangerous- ok disclaimer over </p><p>6. Now make series of 4-5 shot strings (4-5. Shots per string) within the accuracy node. Again everything except powder is same, same case weight, same primer depth, same neck tension. DM me if you need to discuss this</p><p>7. Whichever is the most accurate, regardless of the size of the group - could be 3in, if that's the most accurate we can tune it to the best the rifle can do. Or you could be at 1MOA or under already - call it done for 300y shot, 1MOA gives you a vertical variance of 3in at 300y so that's a dead animal even in poor conditions </p><p>For further development </p><p>8 take most accurate load and start moving off and towards the lands in .01 increments - shouldn't take more than 3 strings </p><p>9. Which ever one the barrel likes now adjust primer depth in increments of .0005 so of stock .003, try .0025 .002, .0035, .004, .005 one of these will shrink the group Significantly.</p><p>10. Lastly neck tension- although this is critical so far you should have been producing exactly same neck tension in each load you have made. Hunting ammo .004 is good .003 is pretty light and .002 is extremely light and could be a problem with recoil moving the bullet unless you plan on doing single feed only</p><p></p><p></p><p>Final note if you have a limited amount of virgin brass - once you have an accuracy node identified reload exact same load in once fired and see what the velocity difference is - there will be some variance - if it remainsin the accuracy node then good, if not you may need to add a.1, .2 grains of powder to maintain accuracy node. Make sense?</p><p></p><p>Let us know how it goes. If you work on this in 3 days you should be done</p></blockquote><p></p>
[QUOTE="7070yshot, post: 1984428, member: 114427"] 2 weeks is plenty of time however knowing what bullet you are using the twist of your barrel would make this quicker. process 1 bullet selected for purpose (Barnes doesn’t like to be that close to the lands 2. Is the bullet weight appropriate for the twist ? Use calculator to determine then check stability factor (Miller formula) to ensure stability above 1.5 3. Create 12-15 loads with only difference being powder in increments of .3 - ensure cases are as close to the same dimensions and weight as possible - within .4 grains smaller variance the better .1 is perfect 4. Primer depth at .003 5. Shoot each round cold bore - very important- ensure you have a good way to measure velocity because that’s all we are after here. Labradar is the best. Record each cold bore shot and make graph looking for widest plateaus if velocity. What I mean is, you will see steady increases in velocity as the powder volume increases- at some point- sometimes 2 areas where the velocity will have much smaller increases or even stay the same. That is your accuracy node. Keep going until you see signs of pressure, sticky bolt, flattened primers, etc, if you never reach signs of pressure then you haven’t gone far enough IMO. You know your rifle and your tolerance for risk so do what you want- certainly not advising you to do anything dangerous- ok disclaimer over 6. Now make series of 4-5 shot strings (4-5. Shots per string) within the accuracy node. Again everything except powder is same, same case weight, same primer depth, same neck tension. DM me if you need to discuss this 7. Whichever is the most accurate, regardless of the size of the group - could be 3in, if that’s the most accurate we can tune it to the best the rifle can do. Or you could be at 1MOA or under already - call it done for 300y shot, 1MOA gives you a vertical variance of 3in at 300y so that’s a dead animal even in poor conditions For further development 8 take most accurate load and start moving off and towards the lands in .01 increments - shouldn’t take more than 3 strings 9. Which ever one the barrel likes now adjust primer depth in increments of .0005 so of stock .003, try .0025 .002, .0035, .004, .005 one of these will shrink the group Significantly. 10. Lastly neck tension- although this is critical so far you should have been producing exactly same neck tension in each load you have made. Hunting ammo .004 is good .003 is pretty light and .002 is extremely light and could be a problem with recoil moving the bullet unless you plan on doing single feed only Final note if you have a limited amount of virgin brass - once you have an accuracy node identified reload exact same load in once fired and see what the velocity difference is - there will be some variance - if it remainsin the accuracy node then good, if not you may need to add a.1, .2 grains of powder to maintain accuracy node. Make sense? Let us know how it goes. If you work on this in 3 days you should be done [/QUOTE]
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