It's a pretty niche cartridge, probably why not many factory options.
That extra 50-100fps over some of the other big 300 Mags isn't really breaking new ground.
338 Lap is an amazing cartridge, pricey to play with, but it performs for that $$.
Necking it down to 308 just makes it all cost the same and perform less.
Your money, but it wouldn't be a rabbit hole I chase lol