7mm Valkyrie AR (7VAR)
The 7mm Valkyrie Ar is a full power Wildcat hunting round developed for the AR15. It's goals were to give AR10 performance in the smaller, lighter AR15 chassis. It is based on the 6.5x47 Lapua case with the shoulder pushed back to allow it to run in the ar15 at 2.295 oal and necked up to 7mm. Case trim length will be 1.596-1.60 and case capacity is 42.6 grains of water.
It is designed around the 140 class of bullets which will run 2750-2850 fps from a 24" barrel. Most 150 and 160 class will also work in it with the 160 sierras being able to run at 2.26 oal so they will work perfectly in standard mags. 160 class bullets will run 2525-2600 fps. 120 class bullets should be in the 2900-3000 range and the 110's in the 3000-3100 range.
The 7VAR can run up to 60,000 psi. With the 2.295 oal PRI 6.8 magazines work best allowing 7 rounds in a 10 round mag. The larger mags don't allow much more capacity because the magazine starts to swell. The 450 bushmaster 5 round mag also works with some slight mods as does the 30 rar magazine.
The Valkyrie is a reloader only caliber for now. The case forming requires neck turning and reaming, neck thickness needs to be .014 - .012. As stated 6.5x47 lapua brass is the best brass to make the cases from. It forms the easiest, lasts the longest, is small primer and handles the pressures the best. Also there is zero loss rate when forming.
6.5 Creedmoor cases also work but the brass is softer and only lasts 2-4 firings on average. It also has a loss rate of 10% when forming from creases/folds in the neck/shoulder area. it does have the highest case capacity. Winchester 308 brass also works but you still have a 10% loss rate when forming.
Dies will be from Whidden gunworks with their competition micrometer seater die which is one of the best in the industry.
Barrels will be made by X-Caliber with choices of
5R:7, 1:8, 5R:8, 1:9 twist rates along with your choice of profile and fluting if wanted. We have been testing the 5r:8 and 1:9 and both are working excellent.
Some of the powders that work well with the Valkyrie are: Leverevolution,CFE 223, xbr 8208, H335,Benchmark, AA2520, TAC, AA2230 and Xterminator. Also r15 and arcomp might also work well also n530, n540 should be workable powders. imr 4166, h4895, imr 4895 will also work but velocities are down from lever and cfe but they have very good accuracy.
Check out the 7VAR-Specific Section at the Wildcat Cartridge Discussion Forums for a lot more information including Load Data and Results! Link: 7VAR FORUM