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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7MM WSM vs 6.5/300 WSM
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<blockquote data-quote="BoatTail" data-source="post: 2328416" data-attributes="member: 74670"><p>About my struggles with the 6.5/300 WSM. After I received the rifle I took it to the range to do a barrel break-in. I used a mixture of new and once fired 270 WSM brass resized and neck turned to my 6.5 WSM requirements. What I discovered was the new brass would fit into the chamber but resized brass would not. I've attached a pic of the once fired brass that has been resized and re-loaded. Yes there is a web mark but it's made brighter when attempting to chamber it in the 6.5 WSM. Let me explain.</p><p></p><p>That web area near the base of the case is where the once fired brass would hand up on loading and not completely seat. Also, some of the new brass had periodic extraction issues. Thinking it was an issue with my 6.5/300 WSM sizing die, I resized them with a 270 WSM die with the neck expander ball removed. This had no effect as the resized reloaded cases still would not seat/headspace right.</p><p></p><p>Last night I looked at the problem closer and I discovered an issue I missed. When I initially worked with my reamer manufacturer on this project, I asked for a SAAMI 270 WSM drawing to document my requested changes. I have done this many times in the past with them making the final adjustments and validations prior to reamer creation. I focused on the neck size, lead, throat and that forcing angle. Where I made the mistake was I did not check the rest of the reamer dimensions to ensure those matched the SAAMI 270 WSM.</p><p></p><p>This is what I found. On the SAAMI 270 WSM drawing, at 0.200" from the case face, the reamer diameter is supposed to be 0.5563". On the provided 270 WSM drawing for my changes, that same location shows 0.5545" or 0.0018" smaller than the SAAMI version it should have been based on.</p><p></p><p>This next part is where I get a little confused. After resizing/forming the 270 WSM once fired cases, the same location, or web area, measures around 0.55". That should not create an interference fit but somehow it does and it is evidenced by the shinny mark on the case web area after attempts to load it.</p><p></p><p>What's clear is I did not properly review the rest of the drawing to validate the reamer dimensions. In the past I had relied on the vendor to check me to help me avoid stupid mistakes, I now realize it is my responsibility to catch any issues and the mistake is on me.</p><p></p><p>This then gets us back to the initial question. Do I even need the 6.5/300 WSM with my new 7mm WSM? Should I have a new 6.5/300 WSM reamer made with the correct chamber size? Is it possible to run a new reamer back into the existing chamber to correct the dimensions, or would it be iffy or create a possible off center chamber issue? The other options are to re-barrel the rifle with a new 6.5 barrel or switch to a 270 WSM barrel.</p><p></p><p>Thoughts?</p></blockquote><p></p>
[QUOTE="BoatTail, post: 2328416, member: 74670"] About my struggles with the 6.5/300 WSM. After I received the rifle I took it to the range to do a barrel break-in. I used a mixture of new and once fired 270 WSM brass resized and neck turned to my 6.5 WSM requirements. What I discovered was the new brass would fit into the chamber but resized brass would not. I've attached a pic of the once fired brass that has been resized and re-loaded. Yes there is a web mark but it's made brighter when attempting to chamber it in the 6.5 WSM. Let me explain. That web area near the base of the case is where the once fired brass would hand up on loading and not completely seat. Also, some of the new brass had periodic extraction issues. Thinking it was an issue with my 6.5/300 WSM sizing die, I resized them with a 270 WSM die with the neck expander ball removed. This had no effect as the resized reloaded cases still would not seat/headspace right. Last night I looked at the problem closer and I discovered an issue I missed. When I initially worked with my reamer manufacturer on this project, I asked for a SAAMI 270 WSM drawing to document my requested changes. I have done this many times in the past with them making the final adjustments and validations prior to reamer creation. I focused on the neck size, lead, throat and that forcing angle. Where I made the mistake was I did not check the rest of the reamer dimensions to ensure those matched the SAAMI 270 WSM. This is what I found. On the SAAMI 270 WSM drawing, at 0.200" from the case face, the reamer diameter is supposed to be 0.5563". On the provided 270 WSM drawing for my changes, that same location shows 0.5545" or 0.0018" smaller than the SAAMI version it should have been based on. This next part is where I get a little confused. After resizing/forming the 270 WSM once fired cases, the same location, or web area, measures around 0.55". That should not create an interference fit but somehow it does and it is evidenced by the shinny mark on the case web area after attempts to load it. What's clear is I did not properly review the rest of the drawing to validate the reamer dimensions. In the past I had relied on the vendor to check me to help me avoid stupid mistakes, I now realize it is my responsibility to catch any issues and the mistake is on me. This then gets us back to the initial question. Do I even need the 6.5/300 WSM with my new 7mm WSM? Should I have a new 6.5/300 WSM reamer made with the correct chamber size? Is it possible to run a new reamer back into the existing chamber to correct the dimensions, or would it be iffy or create a possible off center chamber issue? The other options are to re-barrel the rifle with a new 6.5 barrel or switch to a 270 WSM barrel. Thoughts? [/QUOTE]
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7MM WSM vs 6.5/300 WSM
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