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The Basics, Starting Out
Question: Reamer Dimensions vs Chamber Dimensions vs Case Dimensions
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<blockquote data-quote="Mike Matteson" data-source="post: 3058089" data-attributes="member: 101791"><p>Brass is what a manufactor makes. You have to determine what you want with the reamer. I generally don't change the case length, but reduce the chamber in the neck area. Most of my cases I am going to AI shoulders. I reduces my neck thickness to .013". So most case I cut to reduce the thickness. As far as chamber length I don't change it. My case won't fit into the chamber. I do fireform the cases, by reducing the powder load and extend the bullet into the lands. This in turns push the case base back into the bolt face. That allow the shoulder and neck area extend to fill the chamber. Reducing the case stretch at the bases. </p><p>I cut the necks from brand new cases. I figure I don't need a mandrel to push the irregularity to the outside of the neck. if the case have been fired, I full size them and use a mandrel to puch the irregularity to the outside to cut the necks to do two things. Clean up the thickness and make the neck even inside and out. After that I use a bushing die to set my neck tension. Working the brass less, or I feel I am doing that. Others don't agree, but that's me and them. <img class="smilie smilie--emoji" loading="lazy" alt="😁" title="Beaming face with smiling eyes :grin:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f601.png" data-shortname=":grin:" /> To me their a lot of work that goes into a case before firing it, but onces done its down to annealing and sizing, checking for case length. Again I set the neck tension by bushing not using a mandrel.</p></blockquote><p></p>
[QUOTE="Mike Matteson, post: 3058089, member: 101791"] Brass is what a manufactor makes. You have to determine what you want with the reamer. I generally don't change the case length, but reduce the chamber in the neck area. Most of my cases I am going to AI shoulders. I reduces my neck thickness to .013". So most case I cut to reduce the thickness. As far as chamber length I don't change it. My case won't fit into the chamber. I do fireform the cases, by reducing the powder load and extend the bullet into the lands. This in turns push the case base back into the bolt face. That allow the shoulder and neck area extend to fill the chamber. Reducing the case stretch at the bases. I cut the necks from brand new cases. I figure I don't need a mandrel to push the irregularity to the outside of the neck. if the case have been fired, I full size them and use a mandrel to puch the irregularity to the outside to cut the necks to do two things. Clean up the thickness and make the neck even inside and out. After that I use a bushing die to set my neck tension. Working the brass less, or I feel I am doing that. Others don't agree, but that's me and them. 😁 To me their a lot of work that goes into a case before firing it, but onces done its down to annealing and sizing, checking for case length. Again I set the neck tension by bushing not using a mandrel. [/QUOTE]
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Question: Reamer Dimensions vs Chamber Dimensions vs Case Dimensions
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