shawn, I don't use seirra bullets personally but do know a few gents who do in 7mm rem mags, both use H1000 & 160gr seirras.

I have had goodresults with Imr7828 and RL22 in my 7mm rem mag for 160 gr Nosler bullets. For 150grNBT'sI havebeen usingImr4831 which shoots exceptional. This is my first year using 140 Gr Barnes TSX and RL22 shoots great!! I shot my first animal with the TSX just over a week ago, raghorn bull elk and received excellent performance. Not the biggest bull or toughest test but none the less a complete pass through of ribs with slightly quartering shot, severed lungs and dead elk approx 75 yards later. Blood trail wasn't required but I will say at the shot site it was small but within the first 10 yards or sowas evident and if I had to trackthis animal I would have no problems. I am not sure how it will work on a rib shot for a deer? I hope to find out this fall as I will not be switching this year like in the past.

As far as seating depth my noslers are .010-.015 off the lands. The Barnes are .030 off the lands. In my rifle the accuracy is slightly better the closer to the lands I get but I still want to remain safe and within pressures...these are basically as close as I'd seat them for the loads I am using.

Good Luck and be sure to let us know how your progressing/thoughts on the H1000.