Before my open heart surgery I built a light weight, light recoiling AR-15 with more power than a 223. The 6mm Mongoose fit the bill. Designed to use LC military brass shortened .050 with a blown out body and 40 degree shoulder to use 80 to 95 grain bullets effectively in a 2.26 length mag. It is very effective on song dogs with the 80 grain flat base spire points. And shoots 3/10 inch at 100. With a match trigger it makes a light weight, easy shooter. I can use H-335 or 844 bulk surplus powder
