I think honestly you may be thinking too hard about this......all of the guns you mentioned will do what you said you want to do. The differences in the 3 are minute. I own two 7 mags, and a 30-06, and dont think I would prefer one over the other for what you mentioned. Bullet selection is by far more important that caliber. A 120gr ballistic tip in you 30-06 compared to a 160 gr Partition outta the 7mm changes the equation significantly.