Re: difference in 7 MMs ?????
7mm's are a great caliber,..quite a few different cases to shoot .284" bullets out of.
I have a 7-08AI, a 280, had a 280AI(might build another), have a 7mm Rem Mag and two 7 STW's.
In a factory rifle I would recommend buying a new Rem 700 SPS stainless in 7mm Rem Mag, order a Bell & Carlson Medalist stock with the aluminium bedding block. Tune the trigger to 3# max, some will go 2-1/2#...
It'll weigh 8-1/2 lbs with the B&C stock and a 3.5-10X Leupold in Talley Lightweight rings. It'll shoot well under an inch and at least 3000 fps, maybe 3050-3100 out of the 26" barrel with 160 Accubonds once you tune a load for it.....and it'll kill game as far away as most guys can, or should shoot at game. You'll have about $1200-$1300 in it and it'll last you a lifetime, or until you get bored with it.
I set up a friend with the rig described above last fall........he loves it, and it made me wonder why I mess around with custom rifles that cost more than double his cash outlay.......before you put glass on it.....