The High velocity shell is a Remington Unibody SP. There is data listed in the Alliant Powder Reloader's Guide and the Lyman 4th edition. The Lyman book doesn't cover the black color or the lower height brass-plated steel cap, but the shell is the same. This shell may have either a 6 or 8 point crimp. You should check directly with the powder manufacturer for other questions on Unibody SP data.