I'm giving a professionally restored 1925 Sterly 12ga to a family member who has little experience with shotguns and doesn't own one. A MEC 600 and ingredients will go with it.

To keep it simple, after looking over my powders, I'm thinking of starting him on IMR 700-X, which has done everything for me on upland and waterfowl. Are there disadvantages to 700-X?