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Long Range Hunting & Shooting
30-378
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<blockquote data-quote="Fiftydriver" data-source="post: 972" data-attributes="member: 10"><p>Cam,</p><p></p><p>As a smith specializing in extreme range varmint and hunting rifles, I prefer not to use the Wby Mk V action for the reasons mentioned already. </p><p></p><p>In the amount of time it takes to lap in the lugs of a Mk V, I can have ten Rem M700 actions blue-printed and ready to go.</p><p></p><p>I can cut the locking lug recesses, rear surface of the locking lugs on the bolt and lap the lugs in to +95% contact in very little time.</p><p></p><p>This is not possible with the Wby action.</p><p></p><p>I am in the process of building my personal 1500-2000 yard rifle right now and I will be using a Rem M700 action with a standard 06 bolt face that I have opened up and installed a Sako extractor to.</p><p></p><p>The barrel I will be using is a 34" 1.350" diameter straight cylinder, Fluted SS Lilja in .338" bore with a 1-10" twist. </p><p></p><p>The chamber will be cut to the 338 Kahn(338-378 Wby with a 35* conventional shoulder) I feel the double radius shoulder is another accuracy weak point for the WBY rounds.</p><p></p><p>The barreled action will be riding in a McMillan Tooley 1000 yard BR stock and I will be using a barrel bedding block system of my own design.</p><p></p><p>For extreme range shooting, I would recommend the 338 over the 300 but both work well with the real heavy bullets.</p><p></p><p>The thing to remember about the 30-378 is that these huge cases work better with heavy bullets. 220 gr is where I would start. If I were rebarreling I would use either the Sierra Mk 240 gr or the Graves 230 gr ULD.</p><p></p><p>If your using a 26-28" barrel you might as well use the 300 RUM as it will run within 100 fps of the bigger Wby case in those barrel lengths. </p><p></p><p>With barrels in the +30 range, the big Wby case will start to pull away from the RUM case.</p><p></p><p>For the money, I will go with the 300 gr Sierra Mk or 350 gr Graves ULD 338 bullets over any 308 bullet.</p><p></p><p>Course as a 50 BMG shooter, I like heavy bullets that land hard!</p><p></p><p>Good Shooting!!</p><p></p><p>50</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 972, member: 10"] Cam, As a smith specializing in extreme range varmint and hunting rifles, I prefer not to use the Wby Mk V action for the reasons mentioned already. In the amount of time it takes to lap in the lugs of a Mk V, I can have ten Rem M700 actions blue-printed and ready to go. I can cut the locking lug recesses, rear surface of the locking lugs on the bolt and lap the lugs in to +95% contact in very little time. This is not possible with the Wby action. I am in the process of building my personal 1500-2000 yard rifle right now and I will be using a Rem M700 action with a standard 06 bolt face that I have opened up and installed a Sako extractor to. The barrel I will be using is a 34" 1.350" diameter straight cylinder, Fluted SS Lilja in .338" bore with a 1-10" twist. The chamber will be cut to the 338 Kahn(338-378 Wby with a 35* conventional shoulder) I feel the double radius shoulder is another accuracy weak point for the WBY rounds. The barreled action will be riding in a McMillan Tooley 1000 yard BR stock and I will be using a barrel bedding block system of my own design. For extreme range shooting, I would recommend the 338 over the 300 but both work well with the real heavy bullets. The thing to remember about the 30-378 is that these huge cases work better with heavy bullets. 220 gr is where I would start. If I were rebarreling I would use either the Sierra Mk 240 gr or the Graves 230 gr ULD. If your using a 26-28" barrel you might as well use the 300 RUM as it will run within 100 fps of the bigger Wby case in those barrel lengths. With barrels in the +30 range, the big Wby case will start to pull away from the RUM case. For the money, I will go with the 300 gr Sierra Mk or 350 gr Graves ULD 338 bullets over any 308 bullet. Course as a 50 BMG shooter, I like heavy bullets that land hard! Good Shooting!! 50 [/QUOTE]
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