249-ish is the lightest Cast bullet normally for the H&H ctg I think, however there should be 200gr. available as well, due to the .375 Winchester & perhaps the .38/55.

www.buffaloarms.com

193gr.w/gas check, out of stock and VERY expensive. Single cavity, $205.00 US

https://www.buffaloarms.com/367-193-grain-gas-check-1-ca-jim367193fngc.html