A little late finding this thread ( busy weekend), so my apologies..
I noticed you are interested in the Ledger and the Big Ben bulls. If you didn't know, they are brothers. Both are sired by LT Bluegrass 4017, who was considered " the heifer bull" for a few years in the Charolais breed. I'm pretty sure those two bulls have enough accuracy on their EPDs to believe them.
You probably can't find Bluegrass semen for very cheap anymore, but he proved a heifer bull to me on both reg Charolais, and commercial cows that were mostly Char x Limo.
I have used Bluegrass on heifers as mentioned, and my current bull is a Ledger son who has been easy calving so far. If you wanted to pay shipping I would give you a few straws of him.
All in all without knowing the pedigrees of your heifers I would say either bull would be fine, but I would probably use Ledger. He is shaping up to be the best bull in the breed over the last few years as far as AI bulls.They preform well and have eye appeal to me. Ledger will give nice rump muscling, and my experience has been super quiet disposition.
The LT bulls generally will give you a more Angus ( shorter) head shape, that looks better to me. My :2cents:
Best wishes to you,
Cotton1