Just got this email from Mr. Murray on the 7x46 mm
Below in quotes
"Cold,
Here is my Live Spaces where in the next few days I’ll be dumping all the data for the 7x46mm UIAC, please spread the word.
http://7x46mmuiac.spaces.live.com/
The biggest problem I’m having since returning home is to find that the blank 7.62x39mm cases are actually loaded blanks and wiping the tears from my eyes as I modify a priceless MG42 feed cover.
"
Thanks! It’s nice to get some more of the backstory on that cartridge.
Stephen
Now if we could only see this cartridge hit the marketplace. Should be easier on AR bolts than the .308.
This is quite exciting news. Few years ago, I shot an old Czech rifle chambered in 7.62x45mm and since then I was contemplating about a cartridge made on that case necked down to 6.8-7mm. 
I’m glad is this cartridge is coming out. With this new “multicaliber” ready rifles coming out, this cartridge should be easy to introduce if there’s demand for it.
I’m already imagining a SCAR-H or Masoud in this caliber. Pure sex. 
I think shouldn’t be that hard to get cheap ammo once there’s a platform for it. So many companies in Eastern europe that already work with 7x62x39mm cases, could easily make brass and ammo for it.
Mr. Murray posted this early last year:
"7×46mm UIAC
(Universal Intermediate Assault Cartridge)
1.The 7×46mm UIAC is a true intermediate cartridge in caliber, length, case diameter, and recoil. Performance envelope is 7×43mm and 7×50mm circa 1950, but in a smaller package by using the Pedersen/M43 base instead of the Mauser/30-06 base. Smaller cartridge = smaller weapon.
2.7×46mm UIAC test cartridges outperform all current and purposed military cartridges used worldwide.
3.7×46mm UIAC would comfortably replace all current US and NATO rifle and machine gun cartridges without losing any lethality or range. One cartridge for all our infantry weapons, what a novel concept.
4.Test Cartridge: Muzzle Velocity: 2650 fps; Bullet Weight: 130 grains; Bullet Coeffiency: .411, this is better BC than either the 62 gr. M855 or 150 gr. M80.
5.Projectile is 130 grs. Spitzer Boattail with .411 BC. At targeted velocity. Purposed projectile would be 130gr. FMJ with the profile of a 140 gr. Spitzer Boattail, constructed similar to the 7.92×33 126gr. Polte bullet, this would further enhance the BC. The Polte design insures a rear biased weight, causing rapid upset on impact with soft tissue.
6.Velocity is held at 2650-2700 fps to regulate recoil, heat, pressure, and to allow controllability at combat firing rates in an assault rifle.
7.Purposed DDM cartridge would use .284 Sierra 175 gr. MK, with a BC of .608 even at 2400 fps this projectile has better flight performance than the current M118LR.
8.The 7×46mm UIAC was designed for combat in performance, recoil, and weight."