perfect has been around for some amount of time. 194 Lehigh. Hands down as far as I'm concerned.
If I want to shoot the real heavies 208 amax and 240 SMK. Buy a box of 500 of the 240s you'll be in business a while.
All of them - Too damned expensive.
If I wanted to shoot em tons, I'd cast or buy cast.
That would be an option, especially if you don't mind cleaning your silencer and fooling with molten lead.
For a jacketed bullet doing what the 300BO does best (plinking lots of big, subsonic bullets through a silencer at nothing worth much), tough to beat these Berry's. Probably kills just as well as the SMKs and AMAXs at those speeds.