On Tuesday 16 April 2013 19:54:24 Steve Blackmore did opine: > On Tue, 16 Apr 2013 07:21:18 -0400, you wrote: > >But the QC itself gets loosened and turned because a .125" 2 flute > >endmill is the best tool for boring small holes. I set it straight, > >and use a low angle drill bit to rough out the primer pocket for a > >209, then mount an 1/8" 2 flute coated carbide endmill in the drill > >chuck, which is itself mounted to a 3/8" boring bar holder, and turn > >it so one of its 2 sharp corners is dead level in front, then loosen > >the whole post and turn it about 5 degrees to me. Makes a great > >boring bar for a .240" diameter pocket about .250" deep. > > Gene - .240 is remarkably close to 6mm (.2362 in) - a 6mm endmill, or > flat bottom drill would do that no problem without any of that messing > about, and as they generally cut oversize I'd bet it would be even > closer to .240 :) > > Steve Blackmore
That sure would be something to try, but 6mm isn't available without buying blind on the net, which I'm sure lots of us do. I find .240" exactly isn't usable as the production run primer isn't often that round. I have measured winchester/remington/CCI and found them as much as 17 thousandths out of round. Paper/plastic shotgun hulls don't seem to care as they are pretty compliant. The steel nipple is not so forgiving. So my final pass often measures .243 to .244 in diameter, then most of them will fit. This is also a case of making them (the 209 nipples) one at a time for me as I expect I'd need an FFL to make them commercially. Making them commercially also involves convincing the Joe Sixpacks out there that my stuff is better than the OEM stuff. Not bloody likely in most cases, but my final 5 shots this after noon had 3 of them in one ragged hole. The chronograph said from 1450 to 1527 fps at 80gr of Blackhorn 209 for powder, and the Canadien 300gr swaged hollow point, boat tailed pure lead bullet with a sabot. I started out and shot a card of 270Gr powerbelts, but they were all over the 4' wide mine belting behind my targets. For a card full, I think 6 were actually on the cardboard backer, with 4 on the paper target itself. Crap, undersized for easy loading bullets. You get what you pay for, no exceptions. But thats one of the better ideas, next time I buy tooling, I'll see if they have a 6mm or 4 I can throw into the order. Thanks Steve. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! My views <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml> My haircut is totally traditional! A pen in the hand of this president is far more dangerous than a gun in the hands of 200 million law-abiding citizens. ------------------------------------------------------------------------------ Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis & visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
