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Rifles, Reloading, Optics, Equipment
Reloading
The Chamber vs. The Die.....
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<blockquote data-quote="VinceMule" data-source="post: 2871555" data-attributes="member: 122164"><p>Dies are hardened, 65 Rc is not unusual.</p><p></p><p>Chamber dimensions are all over the map relating to original reamer dimensions, plus wear, plus chambering techniques. Some guys will chamber with techniques that will cut to exact reamer size, while others will not, the devil is in the details. You can open up chambers with 320 grit with Oil while the barrel is turning in the lathe, it does not go real fast with constantly checking dimensions.</p><p></p><p>Throw in the fact that there is a tolerance of +/- .0005 from the reamer maker in the grind.</p><p></p><p>Now throw in different dimensions from various Brass makers.</p><p></p><p>I am very reluctant to jump onto new offerings due to miss match in reamer, dies, and brass.</p><p></p><p>These issues can be EXTREMELY expensive to deal with, and it helps to have a machinist background to even know how to analyze the problem with good measuring tools on hand. </p><p></p><p></p><p></p><p>This is great advice.</p><p></p><p>Where we all get screwed is where the web dimension in the chamber is BARELY over the dimension of New Brass, and this is a goat roping from start to finish, which almost always starts with European brass being used in SAAMI spec Chambers. European brass often should be used in larger CIP spec chambers.</p><p></p><p>Dies do vary in dimension. Often, a Redding bushing Full-length sizer will vary from a Body die which will vary from a standard Full-length sizer in relation to the dimension in the web. Few reloaders have telescoping gauges or small hole gauges to measure dies nor the experience in how to use them. So, an option is to use Cerrosafe to take a chamber cast of the Full Length sizers which is going off the deep end. Brass has a memory, and brass spring back is always a part of Simple Physics you have to take into account.</p><p></p><p>Many of our hunting rifles shoot their best just shy of Max pressure. So, knowing how to size and control the dimension at the Web is of major consequences. There are a few gunsmiths out there that really know their business in this issue of dies, web dimension in the chamber with particular brands of brass. These gunsmiths are worth every penny you spend with them. This information on reamer design is proprietary information, and these highly qualified gunsmiths make their living developing quality service,. These gunsmiths do not talk about Reamer/dies/brass except to their paying customers as a rule.</p></blockquote><p></p>
[QUOTE="VinceMule, post: 2871555, member: 122164"] Dies are hardened, 65 Rc is not unusual. Chamber dimensions are all over the map relating to original reamer dimensions, plus wear, plus chambering techniques. Some guys will chamber with techniques that will cut to exact reamer size, while others will not, the devil is in the details. You can open up chambers with 320 grit with Oil while the barrel is turning in the lathe, it does not go real fast with constantly checking dimensions. Throw in the fact that there is a tolerance of +/- .0005 from the reamer maker in the grind. Now throw in different dimensions from various Brass makers. I am very reluctant to jump onto new offerings due to miss match in reamer, dies, and brass. These issues can be EXTREMELY expensive to deal with, and it helps to have a machinist background to even know how to analyze the problem with good measuring tools on hand. This is great advice. Where we all get screwed is where the web dimension in the chamber is BARELY over the dimension of New Brass, and this is a goat roping from start to finish, which almost always starts with European brass being used in SAAMI spec Chambers. European brass often should be used in larger CIP spec chambers. Dies do vary in dimension. Often, a Redding bushing Full-length sizer will vary from a Body die which will vary from a standard Full-length sizer in relation to the dimension in the web. Few reloaders have telescoping gauges or small hole gauges to measure dies nor the experience in how to use them. So, an option is to use Cerrosafe to take a chamber cast of the Full Length sizers which is going off the deep end. Brass has a memory, and brass spring back is always a part of Simple Physics you have to take into account. Many of our hunting rifles shoot their best just shy of Max pressure. So, knowing how to size and control the dimension at the Web is of major consequences. There are a few gunsmiths out there that really know their business in this issue of dies, web dimension in the chamber with particular brands of brass. These gunsmiths are worth every penny you spend with them. This information on reamer design is proprietary information, and these highly qualified gunsmiths make their living developing quality service,. These gunsmiths do not talk about Reamer/dies/brass except to their paying customers as a rule. [/QUOTE]
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The Chamber vs. The Die.....
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