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Long Range Hunting & Shooting
338 Lapua Drop Verification Question
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<blockquote data-quote="Wachsmann" data-source="post: 994694" data-attributes="member: 10429"><p>I have experienced a similar issue. when shooting at 750 yards. I used someones mag speed chrono at the range but only for 3 shots same powder charge that I always use and it reported 2973-2967-2960 for a 3 shot group. I shot at the 750 yrd mark to validate and I was about 3 to 4 inches high. I used the G7 program and it shows I was running at 3016fps to match the drops. So from what I'm hearing is that usually the mag speeds are always accurate say within 20 fps. I dialed originally for 13.5 but kept shooting high. I dropped .5 moa on my scope and hit the jug center right. The I shot several more shots at the 13moa for group. Gun and shooter shoots about .6moa at this distance. But like everyone has pointed out it could be a number of things. My scope is .5 MOA click value so I'm going to always have a little low or high fudge factor. load is a 230 berger, 89.3grn retumbo, 300 ultra mag. one thing that may been the biggest game changer was I had to open a new 1 lb of retumbo so this lot might be slightly different. forgot about that till now. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll Eyes :rolleyes:" loading="lazy" data-shortname=":rolleyes:" /></p></blockquote><p></p>
[QUOTE="Wachsmann, post: 994694, member: 10429"] I have experienced a similar issue. when shooting at 750 yards. I used someones mag speed chrono at the range but only for 3 shots same powder charge that I always use and it reported 2973-2967-2960 for a 3 shot group. I shot at the 750 yrd mark to validate and I was about 3 to 4 inches high. I used the G7 program and it shows I was running at 3016fps to match the drops. So from what I'm hearing is that usually the mag speeds are always accurate say within 20 fps. I dialed originally for 13.5 but kept shooting high. I dropped .5 moa on my scope and hit the jug center right. The I shot several more shots at the 13moa for group. Gun and shooter shoots about .6moa at this distance. But like everyone has pointed out it could be a number of things. My scope is .5 MOA click value so I'm going to always have a little low or high fudge factor. load is a 230 berger, 89.3grn retumbo, 300 ultra mag. one thing that may been the biggest game changer was I had to open a new 1 lb of retumbo so this lot might be slightly different. forgot about that till now. :rolleyes: [/QUOTE]
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338 Lapua Drop Verification Question
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