There was also a .303 Savage cartridge. It is so much like the .30/30 that a discussion is not worth it. BUT the "claim to fame" was better killing on Canada's largest, elk, moose, etc. And this was because it used a 190 grain bullet, not the 170 standard of the .30/30. Some extremely ignorant confuse the two. Could you have been looking at a box or .303 Savage?
Otherwise, as said, many bullet weights have been loaded in the .303 Brit. I don't recall a 190 in my reading but my research has been "shallow." Nice cartridge and in P14 equal to .308, but ... Luck.