Are you looking for guns and styles? If so go to the manufacturer' s website (Tikka, Savage, Browning, Remington(remington country is its name), Winchester) Then you pick the style of gun you like (ie: Brwoning Stainless Steel (SS) Stalker or Rem. 700 ADL or BDL), it will give you the calibers available and technical specs pertaining to that model. If looking for ammo choices, goto your favorite ammo website (ie: remington, hornady, federal, etc) Look in ammo, Center Fire and the 7 Rem Mag for bullet choice(style and grain), ballistics, etc. Most search engines should pick up the main when you type in the manufacturer' s, as well as distributor companies online. Your best to go to the gun manufacturer' s sites and narrow the choice and compare...then you can go to the others for price comparision, etc. If your looking for reviews, try jesse hunting home page (had a number of gun reviews). Guns and ammo and do a search on article. The Shooting times is yet another that may give you some back issues on cartridges and manufacturers.

Without going into a bunch of data and at the risk of giving overload, they are designed to shoot the same diameter bullet - .284, thus why they are classified 7' s. But the cases in which they use are all different. Thus making them not interchangable and very different in design and characteristics.