Sure there are. Double Tap, Cast Performance, Rimrock all make quality, heavy, flat-nosed hardcast bullets for the 10mm. Ted Nugent used 230 grain DT ammo on a Cape buffalo a number of years ago and I don't remember seeing a big flap on the internet about it. Underwood, Buffalo Bore, Grizzly Cartridge, Double Tap all make quality heavy loads for the 10mm. Plus, LeHigh and CEB both make mono-metal solids for the caliber that would penetrate straight and deep without distorting.

Keep in mind that Lynn Thompson used woefully under-powered .44 Mag loads on truckloads of water buffalo in Australia. Why? Great shot placement and ADEQUATE PENETRATION. Now, a guy like Razor Dobbs uses a smaller diameter cartridge, loaded to higher velocity, shooting a bullet with a much better nose profile than an XTP that doesn't open, and sees penetration to the offside hide of the animal. How in God's name is that inadequate?

You don't have to be in one camp or another here. I'm not abandoning what I do and believe, just saying with the right bullet (pay attention here), lesser calibers are "enough."

I'm still not giving my .500s up, but if you pay me enough I'll go slay a dragon with a 10mm.