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Rifles, Reloading, Optics, Equipment
Reloading
Brass Case Head Separation after 6 firings
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<blockquote data-quote="nksmfamjp" data-source="post: 2528653" data-attributes="member: 1951"><p>[ATTACH=full]365419[/ATTACH]</p><p></p><p>Anybody use this setup to look for thinning brass near the case head?</p><p></p><p>I do and found my 300 Sherman brass all scrapped after 6 firings. I'm pretty careful about sizing after firing. I target 0.003" shoulder bump because at my normal 0.002", there was still a bit of tightness in the final bolt close. Win 70 action.</p><p></p><p>I actually think it came from forming. Now the brass showed the brass thinned about 0.01" radially. After forming, I tested and saw 0.002-0.003" of this thinning.</p><p></p><p>So, my thought is my forming process was bad. I used a false shoulder created with a 0.312 (8mm) expander. I wonder if this wasn't enough. Bullets were jammed 0.005". I was using Peterson brass.</p><p></p><p>Now all I can find is new Starline. I'm thinking COW method and use 0.338 expander to get this false shoulder more solid.</p><p></p><p>Other advice? Am I heading the right way? Anything better.</p></blockquote><p></p>
[QUOTE="nksmfamjp, post: 2528653, member: 1951"] [ATTACH type="full"]365419[/ATTACH] Anybody use this setup to look for thinning brass near the case head? I do and found my 300 Sherman brass all scrapped after 6 firings. I’m pretty careful about sizing after firing. I target 0.003” shoulder bump because at my normal 0.002”, there was still a bit of tightness in the final bolt close. Win 70 action. I actually think it came from forming. Now the brass showed the brass thinned about 0.01” radially. After forming, I tested and saw 0.002-0.003” of this thinning. So, my thought is my forming process was bad. I used a false shoulder created with a 0.312 (8mm) expander. I wonder if this wasn’t enough. Bullets were jammed 0.005”. I was using Peterson brass. Now all I can find is new Starline. I’m thinking COW method and use 0.338 expander to get this false shoulder more solid. Other advice? Am I heading the right way? Anything better. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Brass Case Head Separation after 6 firings
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