Nores: The loads developed for the 0.267" bullets in the Hornady 7th ed. manual utilized Prvi Partian cases, not Norma. The rifle used was a "M41", so at least the models are identical.
Excellent bore condition, particularly in the throat is very important when using bullets with long bearing surfaces Like the 160gr Hornady. If it's rough, you may be able to lap it out.
Although considered by some to be an "identical" powder, I've had rather better results using Winchester 760 than H414. Better accuracy and less pressure signs.