I've used the 140 gr. TSX in my 7mm Mag Sako. 66 grs. of H4831sc along with Fed215M primers in Nosler brasshas worked quite well. Killed the biggest whitetail in my life with this combination last year. As stubblejumper points out, however, this load may not be safe in your particular rifle. Start lower and work up to it if you decide to try it. BTW, these are loaded .050" off the lands as Barnes recommends.