Ron,

The powder charge of 80g is a way plenty for this boolit.

You are correct especially with BH. Your 80 grain load is a full hunting load with that bullet or actually most any bullet over 350 grains. Properties of 'progressive burning' BH approach maximum efficiency of the bullet.

IMO using 80 grains of BH on that bullet would be comparable with using 120 grains of BH on the other bullets you have been testing - sort of screws the testing process as far as comparisons.