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Rifles, Reloading, Optics, Equipment
Gunsmithing
Barrel throating pros & cons
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<blockquote data-quote="Crowe284" data-source="post: 1323439" data-attributes="member: 97064"><p>This is a very old thread I know. I am going down this road of having a barrel throated for a bullet. Can somebody explain to me what the most common way to set up a dummy round is? I have heard 15 things from 15 different people. </p><p></p><p>The biggest thing that I am hung up on is whether or not to factor jump to the lands AND still keep bearing surface above neck shoulder junction? If so, how do you know where to start if you haven't developed a load and know how much the bullet will like to jump?? I have looked at a lot of data on people's loads all over the Internet, but in a gun that has not even been built yet, i would assume that it is just a little better than a wild *** quess...!</p><p></p><p>I will be throating for 180 gr hybrid (7saum). Everything I have read leads me to believe that I will find an accuracy node for seating depth somewhere between .003 and .025 off lands. So.....would it be smart to measure the OAL with boat tail bearing surface junction at neck shoulder junction then add .025 thou for jump and another .005 to stay above neck shoulder junction???</p><p></p><p>If someone has done this with the 7saum on a long action using the 180 hybrid, let me know what you did. </p><p></p><p>Any gunsmiths out there, steer me down the right road please!</p></blockquote><p></p>
[QUOTE="Crowe284, post: 1323439, member: 97064"] This is a very old thread I know. I am going down this road of having a barrel throated for a bullet. Can somebody explain to me what the most common way to set up a dummy round is? I have heard 15 things from 15 different people. The biggest thing that I am hung up on is whether or not to factor jump to the lands AND still keep bearing surface above neck shoulder junction? If so, how do you know where to start if you haven't developed a load and know how much the bullet will like to jump?? I have looked at a lot of data on people's loads all over the Internet, but in a gun that has not even been built yet, i would assume that it is just a little better than a wild *** quess...! I will be throating for 180 gr hybrid (7saum). Everything I have read leads me to believe that I will find an accuracy node for seating depth somewhere between .003 and .025 off lands. So.....would it be smart to measure the OAL with boat tail bearing surface junction at neck shoulder junction then add .025 thou for jump and another .005 to stay above neck shoulder junction??? If someone has done this with the 7saum on a long action using the 180 hybrid, let me know what you did. Any gunsmiths out there, steer me down the right road please! [/QUOTE]
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Barrel throating pros & cons
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