I guess you will have to clear this up a little. There are many 7MM rifles including the 7-30 Waters, 7x57 Mauser, 7MM -08, 7MM WSM, 7mm Rem Mag and the 7MM STW and 7MM RUM. maybe more. For Whitetails the 7x57 and 7MM-08 would be perfect Medicine. The 7mm Mags are all much more than needed for whitetails and would really offer nothing but more recoil over the smaller 7's. Unless you plan on game bigger than deer and want a 7MM, I would recommend the 7MM-08.