I have used Bluegrass with success on many heifers. They dont have the hair i like to see but they are small at birth and grow like weeds. Used LT Ledge rlast year instead to try something a little newer and get a bit more hair and have been impressed to date. Calves are the no bigger then 85 lbs at birth and have the same get up and get going that the Bluegrass calves have. Im thinking the Rio Blanco in Ledger's pedigree will add even more performance then straight Bluegrass. I bought a bred heifer bred AllState and I had to help her, nothing serious but definitley had some bigger shoulders. id agree he is not for 1st calvers. Same with Merit Roundup - good calves just borderline for heifers. Sample size is only one though for each of those bulls so take that for what it is worth. Revelation is also a good choice, but the odd horn or scur will creep in from time to time - if thats a issue or not for you. I have a few Revelation and Blue grass daughters in the herd calved out and they both milk well and will be productie cows for me in the future. I have a really nice Revelation 1st calver with a Ledger bull calf at side who just calved 10 days ago - beautiful udder and nice growthy calf.
Like someone else says, the main thing with a heifer - just get an easy birth and a live calf. Any of Ledger, Bluegrass, Revelation will do that for you.
Then next year breed those FW daughters to a performance bull and you will be on your way.