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The Range
Ammo & Reloading
Load devlopment, how many shots?
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<blockquote data-quote="Profreedomokie" data-source="post: 3281738" data-attributes="member: 524"><p>I took a shooting class a few years ago taught by Gorty Getters. He liked the ladder load development method. Start with your max load for the bullet you're going to use and drop the charge 3 tenths of a grain each for 20 rounds. Put a 2 inch dot on a plain target at 200 yds. Set the rifle on a good bench using rest , film the target if possible while shooting , and use a chronograph if possible. Start shooting the hot loads first and work your way down in order to the lightest. If you don't have a way to film it, use a scope and number where your hits are on the target. When you're done take the 5 hits that group the tightest and fine tune your loads from there. You may find that your hottest loads hit the lowest on the target and the lightest hit the highest. Because of barrel harmonics the muzzle can be vibrating downward when the hot load left the muzzle making it hit low. You want to pick 5 loads that the muzzle was mostly level when the bullet left the barrel. The SSG 69 I used to have did around 14 inches of vertical stringing doing this method. The Steyr 308 Match I have did 3.8" of vertical stringing at 300 yds. using this method.</p></blockquote><p></p>
[QUOTE="Profreedomokie, post: 3281738, member: 524"] I took a shooting class a few years ago taught by Gorty Getters. He liked the ladder load development method. Start with your max load for the bullet you're going to use and drop the charge 3 tenths of a grain each for 20 rounds. Put a 2 inch dot on a plain target at 200 yds. Set the rifle on a good bench using rest , film the target if possible while shooting , and use a chronograph if possible. Start shooting the hot loads first and work your way down in order to the lightest. If you don't have a way to film it, use a scope and number where your hits are on the target. When you're done take the 5 hits that group the tightest and fine tune your loads from there. You may find that your hottest loads hit the lowest on the target and the lightest hit the highest. Because of barrel harmonics the muzzle can be vibrating downward when the hot load left the muzzle making it hit low. You want to pick 5 loads that the muzzle was mostly level when the bullet left the barrel. The SSG 69 I used to have did around 14 inches of vertical stringing doing this method. The Steyr 308 Match I have did 3.8" of vertical stringing at 300 yds. using this method. [/QUOTE]
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