Hi, Daryl -

Trail Boss has proven to be a very good, consistent powder. You don't get great velocities, but you do get very accurate rounds.

By the way, you really ought to build yourself a .416 Taylor. I have been actively reloading for over 40 years now and have not found a caliber much easier to feed than the Taylor. Of the many, many calibers I've shot, the Taylor has proven to be the most fun of them all.

Reggie