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The Basics, Starting Out
Question: Reamer Dimensions vs Chamber Dimensions vs Case Dimensions
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<blockquote data-quote="Alex Wheeler" data-source="post: 3052728" data-attributes="member: 101859"><p>If your getting a custom rifle or barrel built, it will most likely be saami minimum specs on the case body. The freebore is often specd differently based on the bullet choice. Theres no reason to tighten up the body and all it does is cause problems. We dont even do it in Benchrest contrary to popular belief. I highly recommend dealing with a good reamer maker, I use JGS. Never have I got a bad reamer and I have over 150 at this point. With JGS I expect the reamers to measure .0002"-.0003" over print specs. Which is intentional. The reamer should not cut much over that if the gunsmiths setup is good. If the setup is not good then yes it can cut oversized. The worst I have seen was a 300WM .011" oversized. At that point, he was using the reamer as a single point form tool. You can get a lot of chamber out of a reamer if you treat it right. You will never wear the body down enough to have an issue. The freebore is the first part of the reamer to wear to the point that you should replace it. A tight freebore diameter is an accuracy killer. I can tell when they are getting small with a bore scope and retire the reamer even though its still cutting perfectly fine. Theres no number on that though, I have retired some at 50 and have one that I cant kill with many 100s on it.</p></blockquote><p></p>
[QUOTE="Alex Wheeler, post: 3052728, member: 101859"] If your getting a custom rifle or barrel built, it will most likely be saami minimum specs on the case body. The freebore is often specd differently based on the bullet choice. Theres no reason to tighten up the body and all it does is cause problems. We dont even do it in Benchrest contrary to popular belief. I highly recommend dealing with a good reamer maker, I use JGS. Never have I got a bad reamer and I have over 150 at this point. With JGS I expect the reamers to measure .0002"-.0003" over print specs. Which is intentional. The reamer should not cut much over that if the gunsmiths setup is good. If the setup is not good then yes it can cut oversized. The worst I have seen was a 300WM .011" oversized. At that point, he was using the reamer as a single point form tool. You can get a lot of chamber out of a reamer if you treat it right. You will never wear the body down enough to have an issue. The freebore is the first part of the reamer to wear to the point that you should replace it. A tight freebore diameter is an accuracy killer. I can tell when they are getting small with a bore scope and retire the reamer even though its still cutting perfectly fine. Theres no number on that though, I have retired some at 50 and have one that I cant kill with many 100s on it. [/QUOTE]
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Question: Reamer Dimensions vs Chamber Dimensions vs Case Dimensions
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