Absolutely! Please post a picture of the headstamp!
I've been collecting cartridges for 30 years now and I have NEVER heard of this one.
If you find another one in that box of cartridges, PM me and we'll talk money.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.