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Long Range Hunting & Shooting
338 Allen Xpress, RL33 load development
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<blockquote data-quote="Chas1" data-source="post: 1098321" data-attributes="member: 15738"><p>Kirby, 100% load density. I have a question but first some base line info. Test rifle 338AX you built with 31" Krieger Barrel 1-10 twist, 300 gr Bergers atop RL-33 using Lapua brass, COAL 3.8915 and near as I can tell about 0.005 off lands, at sea-level (Florida) early morning temp 79 degrees. I took your advice and started load development at 95 gr and worked up. Results as follows:</p><p></p><p>95 gr.....2627 fps</p><p>96 gr.....2645 fps</p><p>97 gr.....2687 fps</p><p>98 gr.....2722 fps</p><p>99 gr.....2752 fps</p><p>100 gr...2798 fps</p><p>101 gr...2823 fps</p><p>102 gr...2856 fps</p><p>103 gr...2899 fps</p><p>104 gr...2947 fps</p><p></p><p>primers look good, pockets are tight, bolt lift and extraction effortless and no ejector marks at all. I knew I might be getting close on case capacity so when I loaded with 104 gr I listened carefully for any powder crunching...and there was none. Given results I thought I try 105 gr next and then 106 gr and stop there, however when I loaded case with 105 gr and seated bullet I heard an ever so slight, slight powder crunching, almost as if I removed a half dozen kernels it may not have crunched. So when you say 106gr-100% load density are you getting a slight crunching, how do you know if your at 100% load density and am I already there at 105gr ?</p></blockquote><p></p>
[QUOTE="Chas1, post: 1098321, member: 15738"] Kirby, 100% load density. I have a question but first some base line info. Test rifle 338AX you built with 31" Krieger Barrel 1-10 twist, 300 gr Bergers atop RL-33 using Lapua brass, COAL 3.8915 and near as I can tell about 0.005 off lands, at sea-level (Florida) early morning temp 79 degrees. I took your advice and started load development at 95 gr and worked up. Results as follows: 95 gr.....2627 fps 96 gr.....2645 fps 97 gr.....2687 fps 98 gr.....2722 fps 99 gr.....2752 fps 100 gr...2798 fps 101 gr...2823 fps 102 gr...2856 fps 103 gr...2899 fps 104 gr...2947 fps primers look good, pockets are tight, bolt lift and extraction effortless and no ejector marks at all. I knew I might be getting close on case capacity so when I loaded with 104 gr I listened carefully for any powder crunching...and there was none. Given results I thought I try 105 gr next and then 106 gr and stop there, however when I loaded case with 105 gr and seated bullet I heard an ever so slight, slight powder crunching, almost as if I removed a half dozen kernels it may not have crunched. So when you say 106gr-100% load density are you getting a slight crunching, how do you know if your at 100% load density and am I already there at 105gr ? [/QUOTE]
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338 Allen Xpress, RL33 load development
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