Following on the theme of over-full niche marketing. It's absolutely true that most every practical caliber and cartridge type has been made as a wildcat since the '20s. The only things that have evolved significantly since then are bullets and powders.
Another thing I don't quite follow is that somehow a romantic or metric cartridge with a name associated that really rolls off the tongue at campfire discussions- like Whelen or Westley Richards or Rigby is more ballistically capable or "hits harder" than the more mundane, modern decimal cartridges. I've heard folks actually say, "I don't know why, but the 416 Rigby hits harder than the 416 Remington". Never mind that the ballistics are identical
Okiedoakie. Or that such cartridges as the 35 Whelen or 9.3x62 are equivalent to a 375HH. If that theory held true then a 223 would be equivalent to a 243 equivalent to a 257 equivalent to a 264 equivalent to a 270 equivalent to a 284 equivalent to a 308 and so on... therefore a 223 would be equivalent to a 308 ?...
While I really am a romantic type at heart and study, eat and breath history, reality does occasionally get in the way and at some point romantic notions do become academic fantasies.
With the possible exception of Hawk Bullets, I have no idea where to find reliable quantities of modern design, premium hunting bullets for either a .333 or a .330 caliber much less in any variety to allow for meaningful testing or comparison. I constantly hear, "well Woodleigh makes 'em, etc., etc.,". Uh really? Hawk bullets are decent hunting bullets but they are by no means the best of modern technology- being of conventional, non-bonded cup and core design with a fairly thick jacket. Obviously there will be odd NOS boxes of bullets in various calibers by various manufacturers scattered all around the planet but good luck finding them and finding a reliable supply.
But there is no denying the attraction of a romantic caliber like the 375 HH or the 318 Westley Richards. Matter of fact no doubt in my mind, if Bell's 318 ammo was as reliable as his 7x57 ammo, the history of Bell's favorite ivory hunting cartridge would have been different. Bell stated he couldn't recall a misfire shooting his 7x57, 173 FMJ DWM factory ammo but had so many problems with the 318 WR factory ammo he had to abandon it for elephant even though it was his favorite. While disposing of the excess 318 ammo, he was witnessed shooting passing cormorants on the wing with the 318 and at a high percentage hit rate
Near the end of his life he reportedly confessed that if given a do-over, he would probably select a Winchester Model 70 in 308 Win fitted with simple ghost ring rear sight. I think that allows for some reflection about so called "romantic" calibers, eh? I've never heard anyone refer to the 308 as a romantic caliber... save some who longed for the day of the M-14 as our primary military small arm.