 Ackley's earliest wildcats was the 7mm-06 Improved, which was made by necking down the .30-06
Springfield case and fire-forming it to have less body taper and a 40-degree shoulder angle.Soon after the .280 Remington came out, Fred Huntington reformed its case to an improved configuration with minimum body taper, a 35-degree shoulder angle, and called it the .280 RCBS.Since cases for the .280 RCBS could be formed by firing .280 Remington ammo in a rifle chambered for the former, Ackley abandoned the 7mm-06 Improved and started chambering rifles for the .280 RCBS.