May need to be hardened when you get up over 1,800fps with slow powders - earlier with faster ones.
Good weight, good ballistics for many big game animals here in NA. FP bullet? Have you thought of trying a soft nose, hard body? A soft tin/lead mix in the nose will not harden with a water drop like WW or lead shot mix of the body will.

The alloy needs some minor amount of arsenic as well as antimony to harden. The old-style WW and hardened lead shot has enough.

You probably new this, just for others or in case hardening and tempering bullets is new to you. YOu certainly have the loading and casting 'DOWN PAT'.

Looking GREAT - good luck.