Ive shot this bullet in 2 different rifles, a CZ550 and a remington 700, both 7mm Remington Magnums, and both shot <span style="font-weight: bold"><span style="color: #3333FF">very </span></span>well with the bullet seated and magazine length.
My 7-08 did best about 5 thou off. I had the same experience with jamming them - disaster. Also, they do tend to be somewhat sensitive to seating depth. Not like SMKs, that's for sure.