No insight on the brass but at least the Qualcart has a thicker rim and correct headstamp.
I also have some AHR Howell Basic I used to make .400 Whelen.
Just necked it down, have not fired it.
QC, R-P, AHR: Will take a pic(s):

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Ron aka "Rip" for Riflecrank Internationale Permanente
NRA Life Benefactor and Beneficiary
.458 Winchester Magnum, Magnanimous in Victory
THE WALKING DEAD does so remind me of Democrap voters. Donkeypox.