I just checked WSS, no luck. Sierra, Hornady, and Remington bullets all kinda maxed out at 180g. The Hornady 174g RN IL did look pretty interesting though. That would make a killer hunting round for the Enfield and Mosin.
At the 210g+ weight, wouldn't a gas checked cast bullet give the same performance? I'm sure you could do 2200fps with cast.
Other sources you could check: Marstar's frontier plated bullets, Berry's bullets, cast bullet makers. Maybe ask reloaders.ca or henry nierychlo if they have any suggestions for a custom order.