The 308291 was one of the first moulds for gas-checks, about 1906. While designed for 30WCF, they were popular with most .30 caliber rifles, except the Krag. At the first National Military Rifle CBA matches in 2006, I used the 311291 and set a record for 100/200 yard ten shot group aggregate. It is a great 100 yard bullet, but has wind issues at 200 and 300. But none the less, if the wind isn't howling, it will deliver. When I started shooting at Raton and Sioux City, I went to 311284 for the longer ranges.