I was poking around the web for the "ultimate" big game hunting cartridge that would fit in standard AR and came across the 7mm Valkyrie AR (7VAR), it's looks a pretty badass performer. Here are some statements from 7mm Valkyrie AR web site...

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 living up to it's design goals. It will push a 140 grain bullet 2700-2850 fps and 168 bullets 2450-2600 fps. Which puts it in the 7mm-08 range of power but still in an AR15.

The Valkyrie was designed by Bruce Finnegan and he was helped in development by a group of like minded guys they called the Founders.

Pressure testing was done with the pressure trace system along with accuracy testing. We have a pet load chart to get guys up and running fast with the Valkyrie.

Brass is made from 6.5x47 lapua it is the best brass to make the cases from. Other 308 cases will work but performance is sacrificed.

The 7mm VALKYRIE was designed to be one of the most powerful hunting rounds for the AR-15 platform. In order to do that the 7mm VALKYRIE uses a proprietary bolt/barrel extension that are sold with the barrel all other standard AR-15 parts are used.

The remainder of the rifle is all standard AR15 rifle components. To be clear, the 7mm VALKYRIE uses standard, readily available AR-15 upper receivers, bolt carriers, buffers, buffer springs, stocks, gas blocks, barrel nuts, hand guards and lower receivers without modification.

The 7mm VALKYRIE works best with 6.8 PRI magazines because they allow 2.31 oal and they are stiffer so they don't bulge when loading. Some of the longer and heavier bullets require an oal of 2.34 inches which requires a notched magazine which will limit capacity to 5 or so rounds. Other 6.8 and 6.5 mags work but capacity is limited because of the mag swelling when loading. Typically around 4 rounds in the asc 6.8 mag and the cproducts 6.5 mag from my testing.

https://www.7mmvalkyrie.com/

There as forum with a bunch of load information, ballistic gel tests, builds and such...

https://mdws.forumchitchat.com/?forum=467582

I was curious if anyone here has given this round a shot. (Pun intended)