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30-378
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<blockquote data-quote="Fiftydriver" data-source="post: 975" data-attributes="member: 10"><p>Brent Moffitt,</p><p></p><p>In talking with Dan Lilja when researching my extreme range rifle project, he told me about his two long range hammers, both 34", one in 338-378 Wby and the other in the 338-416 Improved.</p><p></p><p>He listed data that reached nearly 3200 fps but he was also using custom actions and not the Rem M700.</p><p></p><p>There is not doubt the M700 can handle these rounds as it has roughly the same bolt lug surface aare and shear area as the Wby Mk V action, especially when you figure that with a factory Mk V, your lucky if 6 out of the 9 bolt lugs actually contact the reciever.</p><p></p><p>I do not wish to drive this rifle to full tilt max pressures, I am looking for 3050 to 3100 fps but accuracy will be my number one priority.</p><p></p><p>I would think that your brothers 338-378 would run a little faster with a quicker powder. From what I have seen, burn rates in the H-1000, Rl-25 and Retumbo are about right for the big 338.</p><p></p><p>H-870 and H-50BMG would be better suited for the 30-378 from what I have seen.</p><p></p><p>I ordered my reamer for a throat of .300" long at .0002" over bullet diameter. This system has worked very well for me in the past. This will also allow the 300 gr Sierra to be loaded so that the junction of the boattail and bullet shank will be seated to the junction of the case neck/shoulder.</p><p></p><p>I do not think I would use the 338-500 Jeffery on a Rem M700 action, that case will create a hell of alot of bolt thrust, much more then the big Wby case.</p><p></p><p>If it were me I would go with a custom action such as a BAT or McMillan or Windrunner for that round.</p><p></p><p>Good Shooting!!!</p><p></p><p>50</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 975, member: 10"] Brent Moffitt, In talking with Dan Lilja when researching my extreme range rifle project, he told me about his two long range hammers, both 34", one in 338-378 Wby and the other in the 338-416 Improved. He listed data that reached nearly 3200 fps but he was also using custom actions and not the Rem M700. There is not doubt the M700 can handle these rounds as it has roughly the same bolt lug surface aare and shear area as the Wby Mk V action, especially when you figure that with a factory Mk V, your lucky if 6 out of the 9 bolt lugs actually contact the reciever. I do not wish to drive this rifle to full tilt max pressures, I am looking for 3050 to 3100 fps but accuracy will be my number one priority. I would think that your brothers 338-378 would run a little faster with a quicker powder. From what I have seen, burn rates in the H-1000, Rl-25 and Retumbo are about right for the big 338. H-870 and H-50BMG would be better suited for the 30-378 from what I have seen. I ordered my reamer for a throat of .300" long at .0002" over bullet diameter. This system has worked very well for me in the past. This will also allow the 300 gr Sierra to be loaded so that the junction of the boattail and bullet shank will be seated to the junction of the case neck/shoulder. I do not think I would use the 338-500 Jeffery on a Rem M700 action, that case will create a hell of alot of bolt thrust, much more then the big Wby case. If it were me I would go with a custom action such as a BAT or McMillan or Windrunner for that round. Good Shooting!!! 50 [/QUOTE]
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