I think the equivalent is a 300 Saum AI.
Some topgun BR guys are currently experimenting with it at 1000Y.
There's lot's of cartridges that will have significantly more velocity and less wind drift but these guys are looking for very low ES and a big cartridge capable of beating a Dasher's or BRA's precision at 1000Y which would be great to a mile because of the higher BC of a heavy 30 cal bullet.
But I shot my 30-375R(much like a 300PRC) and my 375CT at ELR distances and most of the time I couldn't guess the wind good enough to make more reliable hits with the 30 cal, because a 375CT .9BC projectile going 3200 fps blows so much less, even though the 30 cal was more accurate.