Here is the results I have seen from a few 7mm rem mags I load for currently
26", Reloder 26, HBN coated 180 VLD, 3060 fps
26", H1000, 180 VLD, 2980 fps
26", H1000, 175 ELD-X, 2975 fps
24", H1000, 162 ELD-X, 3050 fps
26", H4831sc, 168 VLD, 3075 fps
All have SAAMI chambers/throats. With a longer throat in the 7 mags specifically for the 180 vld, you will get a good bit more performance, and can get somewhat close to a SAAMI spec 28 nosler, as they have a pretty short throat for the heavies. However, a properly throated 28 will significantly outrun a 7mm rem mag.
As stated, components will be cheaper for the 7rm, though the difference for a 1 time purchase of brass (if properly taken care of and not overloaded) will likely be a non-issue. Good brass is available for both now. Apples to apples, the 7 mag will have a longer barrel life obviously, around 400-600 rounds dependent on many things, though with usually 800+ rounds of barrel life if components and shooting is done carefully, the 28 nosler will serve a hunter very well.
Both are not that hard to load very accurately, there is well known data for both. Either is a good choice!!