US Army Considers Adopting an Interim Battle Rifle in 7.62NATO: eventually adopt 6.5

[LRRPF52]

Here's a good article on M855A1 performance, with video: http://www.thefirearmblog.com/blog/2015/...real-deal/

Short story: It smokes AR680 Level III + armor plates, smokes the heavier CMU blocks, and has much better terminal performance with both fragmentation and penetration compared to M855 62gr with the concealed penetrator. It out-performs M80 147gr 7.62x51 NATO with ease when looking at barrier defeat of both armor steel, wonder blocks, and has better wound inflicting characteristics as well. It laid the foundation for the new M80A1 7.62 NATO, which mimics the M855A1 construction, but with a much poorer BC than 147gr M80 FMJBT, attempting to compensate for this poor BC with much higher muzzle velocity.

There was a detailed discussion I recall where the propellant has been re-engineered to reduce chamber pressure without sacrificing too much performance.



[video=youtube;d8IvDPuVuho]http://www.youtube.com/watch?v=d8IvDPuVuho[/video]

[video=youtube;tMSNc3lZsYE]http://www.youtube.com/watch?v=tMSNc3lZsYE[/video]

[video=youtube;qCgyZGhZ2f8]http://www.youtube.com/watch?v=qCgyZGhZ2f8[/video]