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.300 win mag ladder test
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<blockquote data-quote="Mike 338" data-source="post: 1339771" data-attributes="member: 41338"><p>I would say inconclusive. IMO, a ladder test works best with charge weights in about 1% increments or maybe .7 or .8 grains difference per charge. With highly ballistically efficient bullets in your particular caliber (300 WM), you may even go .9 or 1.0 grains between charge weights so your shots don't jumble. Also, if you can, stretch it out to at least 600 yards (more is better) with 6 shots at each charge weight. You should see some pretty obvious separation between different charge weights. The more powder, the higher the bullet should impact. When you find two adjacent charge weights (and in some cases, three) that sorta jumble and don't separate, that's the band of powder charge to work within. The idea being, within a certain pressure range that powder is responsible for, the bullets act the same. When you find that optimal charge weight, you can go back and fine tune the charge weight within the range of that sweet spot and shoot for accuracy and then mess with seating depth to further fine tune it. Forget the wind for now. Your looking for two adjacent charge weights that hit more or less in the same horizontal plane. If you moved back further, you'd see different charge weights separate but at that range, it's just a big jumble of holes that are more or less hitting within the shooters range of error. Good shooting by the way but for me, there is no way to interpret the data. What you have there is not a ladder test because it doesn't ladder.</p></blockquote><p></p>
[QUOTE="Mike 338, post: 1339771, member: 41338"] I would say inconclusive. IMO, a ladder test works best with charge weights in about 1% increments or maybe .7 or .8 grains difference per charge. With highly ballistically efficient bullets in your particular caliber (300 WM), you may even go .9 or 1.0 grains between charge weights so your shots don't jumble. Also, if you can, stretch it out to at least 600 yards (more is better) with 6 shots at each charge weight. You should see some pretty obvious separation between different charge weights. The more powder, the higher the bullet should impact. When you find two adjacent charge weights (and in some cases, three) that sorta jumble and don't separate, that's the band of powder charge to work within. The idea being, within a certain pressure range that powder is responsible for, the bullets act the same. When you find that optimal charge weight, you can go back and fine tune the charge weight within the range of that sweet spot and shoot for accuracy and then mess with seating depth to further fine tune it. Forget the wind for now. Your looking for two adjacent charge weights that hit more or less in the same horizontal plane. If you moved back further, you'd see different charge weights separate but at that range, it's just a big jumble of holes that are more or less hitting within the shooters range of error. Good shooting by the way but for me, there is no way to interpret the data. What you have there is not a ladder test because it doesn't ladder. [/QUOTE]
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