Need Help Milling Hardened H-19 Tool Steel

We are attempting to machine hardened H-19 tool steel. It is in the H-13 family of steels, and is hardened in the low 50's Rc.

It has turned out to be a real "end-mill eater". :bawling:

Does any one have experience with this steel type? I also know that it has a high chromium content.

Thanks in advance for any help or suggestions!