Agreed, the 10X will reach out further than your .223 is capable of shooting so no problem there. Many SFP Scopes come with parallax, the PST - HS- PA from Vortex can be had with parallax adjustment. The 4-16X50 & 4-16X44 have the same field of view. The 50 will allow more light in at low light.
ElkNut1