Cattlemaster 4 VL5 covers most viral infections and is safe for all cattle any age. These are BVD, IBR, vibrio and 5 way lepto (some others I am missing?) This is assuming that the 7-way you speak of is for clostridial (bacterial infections) diseases. Make sure to read the label on your 7-way for pregnant, lactating or young cattle.
Couldn't agree more with D.R. Love the Cattlemaster 4 + VL5. I've used it on everything from open heifers to heavy springers that calved 2 weeks later with no problems. You'll have to give two rounds the first year, 2-4 weeks apart. After that, just an annual booster. They used to sell it in 5 dose packaging. Has to be reconstituted, so resist the urge to just buy a 10 dose and save the leftover for your second round.