No, Hornady, I can't explain that one specific instance regarding the 30-06. All I know is what I;ve experienced myself.
If you want to try experimenting with all the different variables to run a BHN 10 bullet at 1200 FPS with no leading, go for it. I don't have any interest in doing that. I reload to get cheap ammo that performs with better than factory accuracy. I don't feel a need to nibble around the fringes for no reason other than to prove it can be done.
I don't cast, either. I've thought about it many times, but when I can buy perfectly performing 200 grain LSWC's for 45ACP for $60/1000, why buy all the equipment and go through all the hassles and experimentation ?
I can easily scratch a wheel weight with my fingernail ... in my view ... that's soft lead.
REV