You might want to get a body die. I use them on several calibers. i use Redding body dies.You may not be able to see from the image I just posted, but after doing the black magic marker trick on a twice fired piece of brass, full length resized in a standard Lee die, the rubbing point was pretty clearly near the base of the case, where I drew the red line. I took measurements with my calipers: on the black case above, this area measured .467-.468 of an inch. I measured the same area on a new, unfired piece of norma brass, and it measured .462. So how do I size down this area of the case? A small base die? Redding competition shellholders?
Neck trim?I am having a problem with my Cooper rifle, .270 winchester, not being able to chamber brass that has been fired more than 2 times. I was wondering if someone could help me find a solution. It will chamber and fire factory ammo just fine. It will also chamber and fire my hand loads of brand new unfired brass just fine. It will also chamber and fire this same brass just fine when I have full length resized and reloaded it once. However, after the second firing and a second full length resizing, the brass will no longer fit properly in the chamber. It is too tight for the bolt to close without excessive force. It seems to me that even though I full length resize, the brass has nevertheless stretched out enough that it won't fit back into this chamber as normal. I have verified this by measuring all parts of the case with my calipers. Even after a full length resize, all parts of the case are still slightly larger than new, unfired brass. Can you help me understand what is going on? I have never had this problem before in any of my other rifles. I have been using both Norma and Hornady brass. Same problem with both brass. I presume that the chamber in this Cooper rifle is cut very tight? It also looks like standard full length sizing dies do not reduce the brass back to the actual size of factory ammo or unfired brass? This would be very disappointing if I can't reload brass for this gun. Has anyone seen this problem before? Also, is there a body die or something that will resize the brass back to the same size and measurements of brand new brass?
Just had this problem with a 7mag bought used. Had rust n chamber from setting up maybe with a brass left n it. You can take a dial rod cut a slit n it use 400grit sandpaper with oil on it and a drill. Doesn’t take much an it will slick it right. You can also take a case drill an tape case head use all thread out to drill. A little valve grinding compound on case water down a little. Pit it on case we’re u need it spin n fingers a minute to get it work down. Won’t take much to get it worked out
I will update this thread when the small base die arrives. But it may take a while. Because of coronavirus, Midway won't even ship it for a week, then probably another 5 days till it gets to my house. I the meantime I will try some of the other things that have been suggested, such as re-adjusting the dies and maybe grinding down a shellholder.Please let us know how the small base die you ordered works timotheius.
My bet is your problem will be solved! I have seen the same problems in three rifles I own, including a .270 WIN.
If you are going to grind there is nothing like knowing how much to grind; and then precision is out the window.I the meantime I will try some of the other things that have been suggested, such as re-adjusting the dies and maybe grinding down a shellholder.
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