I have been thinking about a mid range AR caliber. I have a .223 and .458socom already. I am not sure any one of these mid range cartridges can be argued superior based on ballistics alone. What other factors are to be considered?? Which one will still be here and in commercial ammo production 5 or 10 years down the road. Does remington have the edge because of the corporate backing on both the gun and ammo side of things??