I have been reloading for my 7mm for a couple of months now, mostly with 162g Hornady's and 175g Sierra's and IMR 4831. My main goal other than save money is to work up to a good round for moose. Since I seem to get better groups with the heavier bullets I plan on going with the Barnes 170g TSX. My question is should I stick with the 4831 or try a slower burning powder like 7828? Is there any difference at all when shooting the same weight bullet but with different construction as with the all copper design of the TSX to the jacketed design of the hornady.