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Rifles, Reloading, Optics, Equipment
Reloading
I need some help explaining this one
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<blockquote data-quote="lynn" data-source="post: 73145" data-attributes="member: 1479"><p><strong>Lablover</strong></p><p></p><p>What you are experiencing with new brass is quite common.In general new brass will give lower velocities with the same powder charge because the brass expands to fit the chamber.Once it is all fireformed velocity will stabilize and your load will need some tweaking to reach best accuracy.</p><p>I don't know which case your using but i suggest you use a 1% increment when working up your load.If your shooting 50 grains of powder vary the charge weight in 0.5 gr increments.</p><p>I also suggest you load your ammo with the bullet seated out for enough so that closing the bolt actually pushes the bullet back into the case a very small amount.This will allow you to safely work up a very accurate load.</p><p>You can now do your ladder test to find your particular guns load window or node.The load window or node is related to the amount of powder your case uses.The bigger the case the wider the node.Once you find two or three bullets in a small cluster you can fine tune for best accuracy.It will generaly be found in the upper half of the load window.</p><p>As an example to help in the explanation we will work with the 300 Ackley round.Shooting a 216 gr bullet and starting at 75.0 grains of powder we will go up in 0.7 grain increments.The bullets will be seated extra long so the bolt pushes them into the case and we will go to the range with 10-12 rounds to be fired at 300 yards.We will now shoot 3-4 rounds at 75.0 grains to get on target and to warm up the freshly cleaned barrel.As we start shooting we notice a very definite vertical stringing at 75.7 76.4 and 77.1 grains.When we shoot 77.8 78.5 79.2 and 79.9 we notice that the vertical is gone even though the powder charge has varied 2.1 grains.</p><p>From many years of testing we know the best accuracy will be found in the upper half of the node or load window.We will now start somewhere near the middle say 79.0 grains and go to say 80.3 grains in 0.3 grain increments shooting 3-5 shot groups.We haven't touched are seating depth at all.At 80.0 grains we discover our best accuracy.The 3-5 shot groups look like little round clusters not tall skinny ones.</p><p>From this point we can now vary the seating depth deeper in 0.005 increments because we already have the bullets seated out as far as possible with the existing neck tension.</p><p>The key here is one step at a time and finding the optimum point at each step.</p><p>Lynn</p></blockquote><p></p>
[QUOTE="lynn, post: 73145, member: 1479"] [b]Lablover[/b] What you are experiencing with new brass is quite common.In general new brass will give lower velocities with the same powder charge because the brass expands to fit the chamber.Once it is all fireformed velocity will stabilize and your load will need some tweaking to reach best accuracy. I don't know which case your using but i suggest you use a 1% increment when working up your load.If your shooting 50 grains of powder vary the charge weight in 0.5 gr increments. I also suggest you load your ammo with the bullet seated out for enough so that closing the bolt actually pushes the bullet back into the case a very small amount.This will allow you to safely work up a very accurate load. You can now do your ladder test to find your particular guns load window or node.The load window or node is related to the amount of powder your case uses.The bigger the case the wider the node.Once you find two or three bullets in a small cluster you can fine tune for best accuracy.It will generaly be found in the upper half of the load window. As an example to help in the explanation we will work with the 300 Ackley round.Shooting a 216 gr bullet and starting at 75.0 grains of powder we will go up in 0.7 grain increments.The bullets will be seated extra long so the bolt pushes them into the case and we will go to the range with 10-12 rounds to be fired at 300 yards.We will now shoot 3-4 rounds at 75.0 grains to get on target and to warm up the freshly cleaned barrel.As we start shooting we notice a very definite vertical stringing at 75.7 76.4 and 77.1 grains.When we shoot 77.8 78.5 79.2 and 79.9 we notice that the vertical is gone even though the powder charge has varied 2.1 grains. From many years of testing we know the best accuracy will be found in the upper half of the node or load window.We will now start somewhere near the middle say 79.0 grains and go to say 80.3 grains in 0.3 grain increments shooting 3-5 shot groups.We haven't touched are seating depth at all.At 80.0 grains we discover our best accuracy.The 3-5 shot groups look like little round clusters not tall skinny ones. From this point we can now vary the seating depth deeper in 0.005 increments because we already have the bullets seated out as far as possible with the existing neck tension. The key here is one step at a time and finding the optimum point at each step. Lynn [/QUOTE]
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