I'd clock that load before I launched it at a game animal.
I just ran a linear regression through a bunch of IMR4895 data for a 140 in the 280. Extrapolating down to 28 grains shows a predicted speed of approximately 1870 fps. So you're starting the bullets out near a typical minimum recommended impact speed.
So an Interlock is sometimes known as a "poor man's Partition" at normal velocity; why not allow a reduced velocity Sierra to be called the "poor man's TSX" ?
