cannot get thru hardening on a die conversion

[6bra1k]

trying to convert a fl busing die to a neck bushing die only
( 6,5x47 to a 6mm gt neck bushing, 6,5x47 is listed as the parent cartridge)
the gt is a bit shorter, and i am having no luck getting thru the hardening.
thinking maybe shorten the die first and then maybe be "under" the hardening ??
open to suggestions
thanks

 

[Shawnba67]

You won't do it with hss, no matter how sharp! The one I did with a carbide bit took some pushing to get through. Under the hardening it machined very nicely

 

[Dave Zander]

CBN tipped insert if its over 55 Rc

 

[jackieschmidt]

The case hardening on most dies is around .010 inch thick. Any carbide tool will break through it. HSS won’t even touch it.

 

[hogpatrol]

I lowered a Redding bushing die to get more of the neck on a 22BR and used a carbide end mill. I don't remember what grade of carbide. Just used what I had on hand.

 

[Steve morgan]

CBN tipped insert if its over 55 Rc

This is it for hardened steel.

 

[Dave Zander]

If the metal is steel and over 55 Rockwell the CBN will cut it . If the material is case hardened 55Rockwell + it will work. Once your thru the case it won't. Switch to carbide. Have cut case hardened steel that around 62 Rc all the time with CBN ,holds up way better than carbide.