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<blockquote data-quote="budlight" data-source="post: 12775" data-attributes="member: 2939"><p>Crow Mag - You've got me rethinking my idea of a 32 inch Lilja target SS 1.250 6 inches then taper to .875 or so using Lapua 338. My thoughts also included a 2 inch brake bringing the barrel length to 34 inches.</p><p></p><p>Correct me if I'm wrong. We did some extensive testing in .277, .284, & .30 using the heavier bullets in each class. Comparing identicle loads using slightly hotter powders like 4831,r-22, 7828, MRP in 24 inch barrels vs. 28 inch.</p><p></p><p> Then and slower powders like 7828, h1000, r-25 h-870 in 26 inch vs 30. We were looking at chrono readings and the gains of FPS with optimized powders for barrel length. Of course it proved that a longer barrels can take advantage of slower powders and have increased FPS.</p><p></p><p>What I did find is that the speed between 28 and 30 inch followed the law of diminishing returns. That's why i kind of limited my barrel idea to 32 inches. </p><p></p><p> Your planing on 40 inches. Am I wrong in thinking that the speed increase is minimal over a 34 including a 2 inch brake? <img src="http://images/icons/confused.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>[ 11-09-2004: Message edited by: budlight ]</p></blockquote><p></p>
[QUOTE="budlight, post: 12775, member: 2939"] Crow Mag - You've got me rethinking my idea of a 32 inch Lilja target SS 1.250 6 inches then taper to .875 or so using Lapua 338. My thoughts also included a 2 inch brake bringing the barrel length to 34 inches. Correct me if I'm wrong. We did some extensive testing in .277, .284, & .30 using the heavier bullets in each class. Comparing identicle loads using slightly hotter powders like 4831,r-22, 7828, MRP in 24 inch barrels vs. 28 inch. Then and slower powders like 7828, h1000, r-25 h-870 in 26 inch vs 30. We were looking at chrono readings and the gains of FPS with optimized powders for barrel length. Of course it proved that a longer barrels can take advantage of slower powders and have increased FPS. What I did find is that the speed between 28 and 30 inch followed the law of diminishing returns. That's why i kind of limited my barrel idea to 32 inches. Your planing on 40 inches. Am I wrong in thinking that the speed increase is minimal over a 34 including a 2 inch brake? [img]images/icons/confused.gif[/img] [ 11-09-2004: Message edited by: budlight ] [/QUOTE]
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