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Load Developement ???
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<blockquote data-quote="squirrelduster" data-source="post: 341105" data-attributes="member: 9736"><p>Are your groups horizontal or vertical?</p><p>If vertical you have load issues, horizontal it could be wind or shooting form. I had horizontal groups on my 300 win mag and it turned out to be me gripping too tight.</p><p></p><p>Work on the powder charge first and when you have everything as good as it gets then work on the seating depth.</p><p></p><p>For your powder charge I would do a ladder test with the powder you are currently using. Do a search on here or 6mmbr.com for instructions. Stay away from the R25 as blue said it is temperature sensitive.</p><p></p><p>An short instruction for a ladder test. </p><p>Load up a series that has the powder charge go up by .4 grains at a time and shoot them at 1 small target at 225 yards. You will see a cluster of three or so loads that will probably be better than than what you are now shooting. Pick the middle one and then do your seating depth testing.</p><p></p><p>Here are the instructions from the Berger website,</p><p><strong>For years we have relayed that it is best to jam the VLD into the lands for best performance. This works for many rifles however there are many rifles that do not shoot the VLD well when the bullet is jammed. We have learned that the VLD can shoot best as much as .150 jump off the rifling. VLD bullets can be sensitive to seating depth and it has been found that these bullets shoot best in a COAL "sweet spot". This sweet spot is a COAL range that is usually .030 to .040 wide. </strong></p><p></p><p> <strong>The quickest way to find this sweet spot is to load ammo at four different COAL. Start with a COAL that allows the bullet to touch the rifling. The next COAL needs to be .040 off the lands. The third COAL needs to be .080 off the lands. The last COAL needs to be .120 off the lands. One of these COAL will outperform the other three by a considerable margin. It has been reported that the VLD bullets don't group as well at 100 yards but get better as the bullet "goes to sleep" at further ranges. We have learned that by doing the four COAL test you will find a COAL where the VLD bullets will group well at 100 yards. Once the COAL that shoots best is established you can tweak +/- .005 or .010 to increase precision or you can adjust powder charges and other load variables. Frankly, those who do the four COAL test usually are happy with the results they get from this test alone. </strong></p><p></p><p></p><p>Keep us posted on your progress. The chronograph is a great tool to tell you extreme spread that will equal vertical spread at long range.</p></blockquote><p></p>
[QUOTE="squirrelduster, post: 341105, member: 9736"] Are your groups horizontal or vertical? If vertical you have load issues, horizontal it could be wind or shooting form. I had horizontal groups on my 300 win mag and it turned out to be me gripping too tight. Work on the powder charge first and when you have everything as good as it gets then work on the seating depth. For your powder charge I would do a ladder test with the powder you are currently using. Do a search on here or 6mmbr.com for instructions. Stay away from the R25 as blue said it is temperature sensitive. An short instruction for a ladder test. Load up a series that has the powder charge go up by .4 grains at a time and shoot them at 1 small target at 225 yards. You will see a cluster of three or so loads that will probably be better than than what you are now shooting. Pick the middle one and then do your seating depth testing. Here are the instructions from the Berger website, [B]For years we have relayed that it is best to jam the VLD into the lands for best performance. This works for many rifles however there are many rifles that do not shoot the VLD well when the bullet is jammed. We have learned that the VLD can shoot best as much as .150 jump off the rifling. VLD bullets can be sensitive to seating depth and it has been found that these bullets shoot best in a COAL “sweet spot”. This sweet spot is a COAL range that is usually .030 to .040 wide. [/B] [B]The quickest way to find this sweet spot is to load ammo at four different COAL. Start with a COAL that allows the bullet to touch the rifling. The next COAL needs to be .040 off the lands. The third COAL needs to be .080 off the lands. The last COAL needs to be .120 off the lands. One of these COAL will outperform the other three by a considerable margin. It has been reported that the VLD bullets don’t group as well at 100 yards but get better as the bullet “goes to sleep” at further ranges. We have learned that by doing the four COAL test you will find a COAL where the VLD bullets will group well at 100 yards. Once the COAL that shoots best is established you can tweak +/- .005 or .010 to increase precision or you can adjust powder charges and other load variables. Frankly, those who do the four COAL test usually are happy with the results they get from this test alone. [/B] Keep us posted on your progress. The chronograph is a great tool to tell you extreme spread that will equal vertical spread at long range. [/QUOTE]
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