That info will help everyone who is shooting your cast bullets.
The POINT is that there is already enough misinformation out there concerning lead bullets--Fact: Harder is NOT necessarily better. Fact: Hardness does NOT make up for a less than ideal fit to the bore. Fiction: Hardness is determined by the quench. *Hardness is more directly related to the alloy--specifically Antimony, and Arsenic less often these days but still relevant. Water dropping won't do squat without the proper alloy first.
The POINT was that you were directing the OP into an idea that a harder bullet is better for higher velocities: my statement was that it is NOT necessarily true, and can in fact be worse. Sorry you got your nose out of joint over it.