I like this new cartridge, I have a DPMS Panther AR-15 in 7.62X39 and from day one have had ammo probs with it, the rifle will not shoot the Wolf ammo at all, out of a 10 round mag, at least 5 or more will not fire. When i changed to Privi Partizan FMJ ammo, no probs at all, also all my hand loaded ammo will fire perfectly. The fastest ammo in my rifle is the Privi Partizan and it runs almost 2400 fps. but cant hunt with FMJ's...so when this cartridge is available in upper receivers, i will get one for sure.
In the mean time, i have a Rock River Arms AR-15 chambered in 458 Socom, it is an awesome shooter and really puts deer down fast. The bullet i load is the Barnes 300 gr Semi Spitzer for 2006 fps. It is a solid 200 yd gun, but the trajectory drops fast after that, but here in the woods of NC it works nicely.
I have loaded the 62 gr Barnes TSX bullet for my 5.56 AR-15 and i have shot it into wet newspaper at around 2800 fps impact velocity. Let me tell you that it smacks the newsprint hard, makes a nice hole going in and a nice cavity inside the newsprint, if it does that to a deer, it will be a dead deer, penetration was a solid 19 inches and the bullet was mushroomed into the classic X bullet shape...awesome damage from something so small, i would definitely use it on deer.
This new calibre for Remington is definitely a winner, cant wait to get one and hunt with it
JimP.