benny243 Posted October 30, 2014 Report Share Posted October 30, 2014 Afternoon people I dont post on here very often but when I have you lovely people have always come up trumps, The problem I have is after seating my heads (80gn nos/bt in 243 with lapua brass) i started to notice a very thin sliver of brass about the thickness of a hair around the mouth of the case where the head meets the case Its as if when the heads seated the mouth of the case is slightly to small and shaves a bit off the head, i only noticed it on the last batch i loaded so with a very fine dentist pick i flicked the sliver off and accuracy is still spot on. Any ideas to whats causing it would be great as I have O.C.D when it comes to reloads Many thanks benny Link to comment Share on other sites More sharing options...
jcampbellsmith Posted October 30, 2014 Report Share Posted October 30, 2014 Benny Are you internally champhering the cases? Regards JCS Link to comment Share on other sites More sharing options...
ejg223 Posted October 30, 2014 Report Share Posted October 30, 2014 Chamfer with 1:10 reamer. gives a nice flat angle. Something like this. http://www.hoffmann-tools.com/zerspanung/16-reibahlen/kegel-reibahle-1-10-3x10-mm-holex.html#.VFJEJJUqXmQ edi Link to comment Share on other sites More sharing options...
benny243 Posted October 30, 2014 Author Report Share Posted October 30, 2014 Yes all chamfered as normal, I wondered if there was something wrong with the sizing die (although I havnt noticed it before) I always clean of any sizing lube with meths so i dont think thats the problem What about a slightly oversized batch of bullet heads? Link to comment Share on other sites More sharing options...
jcampbellsmith Posted October 30, 2014 Report Share Posted October 30, 2014 Benny Can I suggest disassembling a couple of rounds and looking closely at the bearing surface of the bullet? Is it dented or scratched in any way? Does it require a lot of effort to free the bullet from the neck? Can I also suggest disassembling the re-sizing die and giving it a thorough clean? Is your seating die correctly adjusted? Could you be accidentally applying a crimp? Finally, words only reach so far, could you post a photo of the issue? Regards JCS Link to comment Share on other sites More sharing options...
benny243 Posted October 30, 2014 Author Report Share Posted October 30, 2014 Thanks for the replys I shall give the above a try and I'll try and upload a pic Link to comment Share on other sites More sharing options...
gunner Posted October 31, 2014 Report Share Posted October 31, 2014 Benny hi , i had this problem recently , and this was on brass sized with 1 and 2 thou bushing die . I got over it by replacing my rcbs chamfer to a lyman vld type and going slightly deeper than normal ! Std angle chamfer tools seem to leave a sharpish corner on the case mouth . And as copper is a soft metal - hence some 'shaving' . Or you could wire wool , but tiny debris could get into case ! Good luck . Link to comment Share on other sites More sharing options...
benny243 Posted November 1, 2014 Author Report Share Posted November 1, 2014 J campbellsmith, ejg223 and gunner many thanks for taking the time to reply, after listening to your advice I have had a close look at my case prepping and its dawned on me that the problem started at the same time i started using an rcbs case prep centre. The internal chamfer tool after looking close look is nowhere near as sharp as my old chamfer tool (looks like a brenneka slug) So i'll go back to the old fashioned manual way Thanks again Link to comment Share on other sites More sharing options...
Ronin Posted November 2, 2014 Report Share Posted November 2, 2014 Buy or source a Hollands VLD chamfering tool for the inside of the case neck - use the Wilson style tool for the outside of the neck, then give the case a few turns on a scotch brite pad to remove burrs. You shouldn't have shavings of copper anymore. Link to comment Share on other sites More sharing options...
ejg223 Posted November 3, 2014 Report Share Posted November 3, 2014 All I can say is try a 1:10 reamer, the angle is much flatter than the standard 45 deg and feeds much better/smoother. edi Link to comment Share on other sites More sharing options...
jcampbellsmith Posted November 3, 2014 Report Share Posted November 3, 2014 Benny. I like these reamers - https://www.kmshooting.com/catalog/new-products/controlled-depth-tapered-reamer-large-6mm-338.html but there are other good options too. Regards JCS Link to comment Share on other sites More sharing options...
benny243 Posted November 12, 2014 Author Report Share Posted November 12, 2014 Cheers chaps I've gone back to my old rcbs hand tool which seems to have done the trick but I intend to order one from the link above Thanks benny Link to comment Share on other sites More sharing options...
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