I think you've answered your own question. The BDC's will work if you never change your load, barrel or elevation.
If you are going to dial your turrets anyway, drop charts and MOA dials will work for all locations, bullet combos etc.
Carrying a drop chart works, or simply tape it to your stock, the inside of a scope cap or just out to 700 yards, memorize it.
Do a search on Ballistics Software here on the forum.
Many people here feel the top of the line software is Exbal, it is nice for giving you an idea of a drop chart for your load/bullet combo. Obviously, you need to shoot at distance to verify the charts.
Hope this helps, and Welcome to the forum.