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<p>[QUOTE=&quot;Rick Stachowski, post: 2769522, member: 42872&quot;]Here&#039;s an article from Error Ref on a collar clash .</p><p><a href="http://www.error-ref.com/collar-clash/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.error-ref.com/collar-clash/" rel="nofollow">http://www.error-ref.com/collar-clash/</a></p><p><br /></p><p>I guess it also could be caused from this quote from the article .</p><p><br /></p><p>&quot; When collar clash occurs on the anvil die, it is probably from a repeated up-and-down scraping action of the die neck against the working face of the collar.&nbsp; However, a sharp sideways impact that drives the die neck into the collar’s working face could also produce this pattern of serrations &quot;.[/QUOTE]</p><p><br /></p>

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