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Rifles, Reloading, Optics, Equipment
Reloading
375 RUM with 350gr MK
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<blockquote data-quote="yorke-1" data-source="post: 920308" data-attributes="member: 11960"><p>I have to admit that this is pretty funny. I called it the Box Monkey Express (BME) after my business Box Monkey Distribution Inc. just for fun at first but the name seems to have caught on. To my knowledge I have the only reamer and the only barrel chambered for this particular version of the 375/404 Improved. It is listed by Pacific Tool and Gage as the 375 RUM Improved 40* I believe. I have the reamer print number if you're interested. A fully fireformed case holds 122.7gr of water on my scale. Honestly the biggest improvement over the standard RUM came from being able to seat the bullets out so far. My usable case capacity with a bullet seated just off the lands is 113.7gr water. My OAL is 4.175" and this isn't quite touching the lands. Definitely not going to work as a repeater!</p><p></p><p>For loads I've played with a few different powders but H1000 is pretty much my standard. I get .5 MOA accuracy, which I feel is more than acceptably for a caliber like this, and an average SD of 7fps from my loads. I've hit higher velocities with other powders but without pressure testing equipment the velocities just seemed too high to be safe so I backed it down to around 3050 fps. Lets face it, a 350gr bullet at 3000+ fps is more than enough for the average shooter! I imagine that Retumbo would work well too, I just don't have any to try.</p><p></p><p>If you have any specific questions about the loads you can shoot me a message. </p><p></p><p>Andrew</p></blockquote><p></p>
[QUOTE="yorke-1, post: 920308, member: 11960"] I have to admit that this is pretty funny. I called it the Box Monkey Express (BME) after my business Box Monkey Distribution Inc. just for fun at first but the name seems to have caught on. To my knowledge I have the only reamer and the only barrel chambered for this particular version of the 375/404 Improved. It is listed by Pacific Tool and Gage as the 375 RUM Improved 40* I believe. I have the reamer print number if you're interested. A fully fireformed case holds 122.7gr of water on my scale. Honestly the biggest improvement over the standard RUM came from being able to seat the bullets out so far. My usable case capacity with a bullet seated just off the lands is 113.7gr water. My OAL is 4.175" and this isn't quite touching the lands. Definitely not going to work as a repeater! For loads I've played with a few different powders but H1000 is pretty much my standard. I get .5 MOA accuracy, which I feel is more than acceptably for a caliber like this, and an average SD of 7fps from my loads. I've hit higher velocities with other powders but without pressure testing equipment the velocities just seemed too high to be safe so I backed it down to around 3050 fps. Lets face it, a 350gr bullet at 3000+ fps is more than enough for the average shooter! I imagine that Retumbo would work well too, I just don't have any to try. If you have any specific questions about the loads you can shoot me a message. Andrew [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
375 RUM with 350gr MK
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