[303tom]

The only thing the .303 British & the 7.7x58 Arisaka have in common is the bullet, you can make cases from the 06 Springfield & the 57 Mauser............

[nitestalker]

The 7.7 is based on the .303 Brit. both case and bullet. Yes you can use an 06 case but it does not change the history. The JIS metrics used in Japan were taken from the English standards as were most industrial processes at the turn of the 20th century. The Japanese supplied Arisaki rifles to the British Army during WWI. The turning of the rim on the .303 for use in their own weapons was easy.

[Trez]

Then why is the 7.7 case 2mm longer?

[nitestalker]

The case is based on the .303 Brit. There was a always a problem with engineering when Japan modified the British Metrics to the Japanese Metric Standard or JIS which differs from the Komotsu Metrics. It is not enough to worry about. The English had a problem making ammo to fit the Arisaki rifles they used due to these differences.

[303tom]

Originally Posted by nitestalker

The case is based on the .303 Brit. There was a always a problem with engineering when Japan modified the British Metrics to the Japanese Metric Standard or JIS which differs from the Komotsu Metrics. It is not enough to worry about. The English had a problem making ammo to fit the Arisaki rifles they used due to these differences.

http://en.wikipedia.org/wiki/7.7x58mm_Arisaka