6mm-250 (6mm International)

Historical Notes:

Prior to World War II, the 6mm (243 caliber) was nearly exclusive to British and European development, with some cartridges dating back to the early 1900's. Immediately after WWII, American wildcatters began to work with this caliber. The simple process of necking the 250 Savage case down to take 243 bullets probably occurred to several individuals, but was obscured by other 6mm developments. Several versions exist, but two of these have become popular with benchrest and match shooters. The Donaldson 6mm International was developed by Harvey Donaldson of Fultonville, New York, know as the father of benchrest shooting. The Remington 6mm International originated with Mike Walker of the Remington Arms Company.

General Comments:

Cartridges of the 6mm based on the 250 Savage case are all similar, but vary slightly in length and shoulder angle. Original design was the 250 case necked down with no other change. The Donaldson version uses a case 0.25 inch shorter than the standard 250 and with the shoulder pushed back, creating a long neck. Body taper and shoulder angle are the same as the 250. The Remington 40X match rifle has been chambered, on special order, for the Walker cartridge. Robert Hutton, long time experimenter and gun writer, has worked with these cartridges and his results were presented in the 1962 (16th edition) of Gun Digest. The late John T. Amber reported 5/8 inch averages for five shot, 100 yard groups with the Walker cartridge in the Remington 40X target rifle.

Source: Cartridges of the World

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