What does each match up closest to in a rifle cartridge?

say 385grs @ 2000fps....
and 260grs @ 2000fps...

385grs would be almost a .416caliber moving a bit slower though, but a .416 rigby is 400grs moving at around 2400fps...

260grs is about a .338 or .375 caliber, so I'm thinking perhaps a .338federal ?
either way would someone argue a .338federal isn't enough for deer?

One thing to note though the latest and greatest for slugs at least currently will come out first for a 12ga, thought I suspect soon both will be released at the sametime or as the 20ga gains popularity.