The 7mm Valkyrie AR is a wildcat hunting round being developed for the AR15. 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 should be in the 42-43.5 grains of water.
It is designed around the 140 class of bullets which should be pushed to 2750-2850 fps from a 24" barrel. Some 150 and 160 class will also be able to run in it with the 160 sierras being able to run at 2.25 oal so they will work perfectly in 300 black out mags. Estimates are for 2600 fps from the 160's. 120 class bullets should be in the 2900-3000 range and the 110's in the 3000-3100 range
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 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.
There will be 3 or 4 guys offering brass conversion for the 7 VAR, 270AR and the 257 Bobcat. Already processed brass will also be available in a limited capacity to start.
Dies will be from Whidden gunworks with their competition micrometer seater die which is one of the best in the industry.
Some of the powders expected to work well with the Valkyrie are: CFE 223, Leverevolution, xbr 8208, H335, AA2520, Tac, Xterminator. Also r15 and arcomp might also work well also n530,n540 and n550 should be workable powders.
7mm Valkyrie AR
Catridge overall length 2.295 inches
Case trim to length 1.596-1.6 inches
Max bullet length at 2.295 oal 1.3 inches
Max bullet length at 2.335 Oal 1.35 inches
120 class bullets 140 class bullets
16" 2750-2810 16" 2550-2620
20" 2850-2950 20" 2690-2740
22" 2900-3000 22" 2750-2800
24" 2950-3050 24" 2790-2850
150 class bullets 160 class bullets
16" 2475-2525 16" 2400-2450
20" 2600-2650 20" 2500-2550
22" 2625-2700 22" 2550-2600
24" 2700-2750 24" 2590-2650
Test results from 26" savage test barrel 1-9 twist.