AMU still testing new cartridges

**constructor** · 11-05-14, 19:41

Just last week they asked for bids to manufacture brass(poly or poly hybrid cases).
Lightweight Intermediate Caliber Cartridges (LICCs)

Load and deliver mature test sample ammunition of 264 USA and 277 USA cartridges with lightweight (threshold); polymer (objective) cartridge cases with Sierra HPBT "MatchKing" projectiles.

Cartridges will function in modified, purpose-built AR-10 rifles and magazines in the semi-automatic and fully automatic modes of fire with and without the use of a muzzle-mounted signature suppressor.

Accuracy: 1.5 MOA (threshold); 1.0 MOA (objective) to 600 m (threshold); 800 m (objective).
Cartridges will function in modified, purpose-built AR-10 rifles and magazines in the semi-automatic and fully automatic modes of fire with and without the use of a muzzle-mounted signature suppressor.

It is basically Murray's 7mmUIAC but, in 6.5 or .277 caliber. Based on the 6.5 Carcano. I have 2 Nextgen rifles chambered in 6.5x45 and 6.8x45 wildcats based on the Carcano. The cartridges feed perfectly from 308 Pmags. They run apx 200 -250fps faster than the Grendel and 6.8.

http://7x46mmuiac.com/7x46mm_Cartridge.html

**notorious_ar15** · 11-05-14, 20:28

Very interesting, although I'm wondering why they would pursue this instead of something similar in 6.8SPC, 6.5 Grendel, or 300 BLk - considering those would fit into the existing M4 platform? I'm not an expert by any means, just have a genuine curiosity...

**constructor** · 11-05-14, 21:32

Originally Posted by notorious_ar15

Very interesting, although I'm wondering why they would pursue this instead of something similar in 6.8SPC, 6.5 Grendel, or 300 BLk - considering those would fit into the existing M4 platform? I'm not an expert by any means, just have a genuine curiosity...

They want something that will out perform the 308 ballistics while reducing recoil and being 20% lighter. The Grendel and 6.8 were apx 200fps too slow, the blk 0ver 400fps too slow. We designed a few all copper bullets in the 115-118gr range with a G7 Bc of .250(G1-.500). The case need a minimum H2O capacity of 42 gr to push a bullet that weight to 2700fps + from a 16" barrel.
They will probably use it in the SCAR17, possibly modified. Carcano based cartridges feed perfectly from 308 pmags.

**Vegasshooter** · 11-07-14, 20:04

What would this new cartridge do that can't be done with a .260 or a 6.5Creedmore? Just curious? They are currently about the hottest ticket out to 1000yds. They are high B.C. and less recoil than a .308.

**constructor** · 11-08-14, 08:28

Originally Posted by Vegasshooter

What would this new cartridge do that can't be done with a .260 or a 6.5Creedmore? Just curious? They are currently about the hottest ticket out to 1000yds. They are high B.C. and less recoil than a .308.

20% weight reduction and not enough recoil reduction. Not enough difference from the 308.