Tankerjockey is right per my understanding. When A-Square submitted the 338-06 to SAAMI for standardization they submitted the standard 338-06 that was know to wildcatters for years and since it cost considerable money to have these cartridges standardized A-Square wanted their name on it. The 338-06 AI is the Ackley version of the standard 338-06/338-06 Asq.
