Contrary to the last post, both my study of the subject and my own experience is that deep seating bullets does indeed raise pressure. While that pressure rise [due to the lessened case volume] might not be crucial in a light load, in a heavier load it could cause difficulty, especially in the 45-70, for which many rifles are weak compared to modern actions. Murphy's Law has a way of intruding itself.

I would ask that poster to reconsider, amend his post or supply substantiation regarding the 45-70 and Hornady brass. If I am mistaken, I will stand corrected.

Regards,

Dyson