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The Basics, Starting Out
Help me understand freebore. 7 SAUM 180 ELDM
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<blockquote data-quote="Jud96" data-source="post: 2108347" data-attributes="member: 69478"><p>I asked basically the same exact question on here and another popular forum a little while ago. From my observations and what others pitched in, it's very very hard to nail down the freebore to be exactly what you want. Because like you said, there's a small taper (lead) right after the end of the freebore. So the math is very involved and changes with different ogives on different bullets. From studying reamer prints and my loaded rounds this is what I do. I typically shoot Berger bullets so I use their bullet list to figure out the bearing surface length of the bullet. I subtract the neck length of the cartridge case then add .030-.050 to get above the neck shoulder junction. Then what's left I subtract 0.020 from for the angle just ahead of the case mouth then subtract 0.020 for the angle beyond the freebore. What's left is how much freebore I would want. This is all a guesstimate though. You don't really know until you experiment with ordering and testing multiple reamers. I'm not on that level yet, so for now I do the above method to get an idea.</p></blockquote><p></p>
[QUOTE="Jud96, post: 2108347, member: 69478"] I asked basically the same exact question on here and another popular forum a little while ago. From my observations and what others pitched in, it’s very very hard to nail down the freebore to be exactly what you want. Because like you said, there’s a small taper (lead) right after the end of the freebore. So the math is very involved and changes with different ogives on different bullets. From studying reamer prints and my loaded rounds this is what I do. I typically shoot Berger bullets so I use their bullet list to figure out the bearing surface length of the bullet. I subtract the neck length of the cartridge case then add .030-.050 to get above the neck shoulder junction. Then what’s left I subtract 0.020 from for the angle just ahead of the case mouth then subtract 0.020 for the angle beyond the freebore. What’s left is how much freebore I would want. This is all a guesstimate though. You don’t really know until you experiment with ordering and testing multiple reamers. I’m not on that level yet, so for now I do the above method to get an idea. [/QUOTE]
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The Basics, Starting Out
Help me understand freebore. 7 SAUM 180 ELDM
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