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Rifles, Reloading, Optics, Equipment
Gunsmithing
Questions about reamers
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<blockquote data-quote="odoylerules" data-source="post: 1348361" data-attributes="member: 99160"><p>Hey guys, I have some questions that might seem basic to some of you so please bare with me. </p><p>I am in the process of acquiring the parts for my first "from scratch" custom rifle. It'll be a defiant hunter action, with a 28" 1/8 twist proof barrel chambered in 7-300wm. I've already ordered the parts and am committed. I want to run the 195 Bergers because this is a mostly long range hunting rifle and terminal energy is a high priority. "I like big bullets and I cannot lie!"</p><p>So...reamers. </p><p>It's obvious I've jumped into the deep end of the pool. I want to make sure I have a solid understanding of some concepts and don't make any mistakes. I'm in the process of making up some dummy rounds to potentially get a custom reamer. I have read many people say it is dangerous to set up a chamber for just one bullet in case your rifle doesn't like it. I find that strange a little. With good load development I'm sure I can get it shooting well can't I?</p><p> If I make a dummy round, what should I tell the reamer maker? I don't know where to set it up? I have asked people where they have set up their rounds for this cartridge and have gotten answers like "20 thou off the lands", and .168-.260 freebore. When someone says .260 freebore, does that mean it's that far from the ogive to the lands? Seems like a hell of a jump. </p><p> My other question about the type of reamer. Should I get HSS, Carbide, one piece or separate throater? I've heard some guys say the separate throater invites problems with concentricity and other issues. When someone says they have a reamer that is set with .168 free bore, Does that mean it is that dimension for a specific bullet? How is freebore measured? From the end of the case or what? Some bullets are way longer than others so I want to understand this concept.</p><p> Should I go the custom reamer route or just find a gunsmith, let them run with it and trust them to provide the end product?</p></blockquote><p></p>
[QUOTE="odoylerules, post: 1348361, member: 99160"] Hey guys, I have some questions that might seem basic to some of you so please bare with me. I am in the process of acquiring the parts for my first “from scratch” custom rifle. It’ll be a defiant hunter action, with a 28” 1/8 twist proof barrel chambered in 7-300wm. I’ve already ordered the parts and am committed. I want to run the 195 Bergers because this is a mostly long range hunting rifle and terminal energy is a high priority. “I like big bullets and I cannot lie!” So...reamers. It’s obvious I’ve jumped into the deep end of the pool. I want to make sure I have a solid understanding of some concepts and don’t make any mistakes. I’m in the process of making up some dummy rounds to potentially get a custom reamer. I have read many people say it is dangerous to set up a chamber for just one bullet in case your rifle doesn’t like it. I find that strange a little. With good load development I’m sure I can get it shooting well can’t I? If I make a dummy round, what should I tell the reamer maker? I don’t know where to set it up? I have asked people where they have set up their rounds for this cartridge and have gotten answers like “20 thou off the lands”, and .168-.260 freebore. When someone says .260 freebore, does that mean it’s that far from the ogive to the lands? Seems like a hell of a jump. My other question about the type of reamer. Should I get HSS, Carbide, one piece or separate throater? I’ve heard some guys say the separate throater invites problems with concentricity and other issues. When someone says they have a reamer that is set with .168 free bore, Does that mean it is that dimension for a specific bullet? How is freebore measured? From the end of the case or what? Some bullets are way longer than others so I want to understand this concept. Should I go the custom reamer route or just find a gunsmith, let them run with it and trust them to provide the end product? [/QUOTE]
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