Pretty sure the FBI quit using 147 gr Hydra's due to excessive pressure issues
Nope, the FBI quit using the 147 gr. Federal Hydra-Shok because the contract ran out and the new contract was won by a different load.
Actually, they didn't just "quit". The loading continued to be authorized until supplies were exhausted.
I am unaware of any pressure issues the FBI experienced with 147 gr. Federal Hydra-Shok.
I hope this prevents an Internet rumor.