7.7 Japanese

GeoDudeFlorida said:
7.7Jap is based on the British .303 Mk.7 cartridge but cut into a rimless shell to help it feed better in a Mauser action. In theory I’m guessing this means any powder and projectile that works well in the rifle No.3 Mk1/1*. (?). My goto powder for the No.3 is IMR 4064 with IMR 4895 as a standby substitute. The Sierra 180gr RNSP is a great hunting bullet for the .303 so it should play well in the 7.7 also. The Remington 174gr FMJ component bullets are excellent for target shooting but I haven’t seen any in years. Maybe check out the auction sites.
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I've yet run across a source that says the 7.7 Arisaka was a rimless .303 Brit. The Japanese at the time tended to copy whoever was best. For example, their Navy was drawn from the British. Their military was initially French until they loss against the Germans. China acquired a lot of German WWI surplus. When the Japanese invaded China with their 6.5 Arisaka, they encountered the 8mm Mauser used by the Chinese. The Japanese already had the Lewis gun with .303. And the change of the Japanese fighting the British was higher. The Russians used a .303 bullet of their own. So, a necked down 8mm Mauser was adopted. My experience, my Arisaka shoots best with hot loads. That's beyond the .303. But why is the 7.7 Arisaka loaded so low? I don't have an answer. Maybe because the Japanese soldier was small and these soldiers couldn't handle a full load?
 
BJung said:
I've yet run across a source that says the 7.7 Arisaka was a rimless .303 Brit. The Japanese at the time tended to copy whoever was best. For example, their Navy was drawn from the British. Their military was initially French until they loss against the Germans. China acquired a lot of German WWI surplus. When the Japanese invaded China with their 6.5 Arisaka, they encountered the 8mm Mauser used by the Chinese. The Japanese already had the Lewis gun with .303. And the change of the Japanese fighting the British was higher. The Russians used a .303 bullet of their own. So, a necked down 8mm Mauser was adopted. My experience, my Arisaka shoots best with hot loads. That's beyond the .303. But why is the 7.7 Arisaka loaded so low? I don't have an answer. Maybe because the Japanese soldier was small and these soldiers couldn't handle a full load?
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So you saying…. I can’t stop laughing at the 7.7 vs. 303. BTW.. british men were also historically very short & small because of their diet. Big Men is a very much Modern invention
 
BJung said:
I've yet run across a source that says the 7.7 Arisaka was a rimless .303 Brit. The Japanese at the time tended to copy whoever was best. For example, their Navy was drawn from the British. Their military was initially French until they loss against the Germans. China acquired a lot of German WWI surplus. When the Japanese invaded China with their 6.5 Arisaka, they encountered the 8mm Mauser used by the Chinese. The Japanese already had the Lewis gun with .303. And the change of the Japanese fighting the British was higher. The Russians used a .303 bullet of their own. So, a necked down 8mm Mauser was adopted. My experience, my Arisaka shoots best with hot loads. That's beyond the .303. But why is the 7.7 Arisaka loaded so low? I don't have an answer. Maybe because the Japanese soldier was small and these soldiers couldn't handle a full load?
Click to expand...
I think because they operated in the tropics. High Temps affect pressure quite a bit.
 
allisd17 said:
Got out the 7.7 dies; sized, trimmed and primed 15 cases. Gotta keep up with Mark_Mark and AJC1 😁

View attachment 1196262
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Good luck I just emptied 49 today.... I did have one ftf with recycled priners... 1708817614603218780393542632125.jpg


what may be more intresting is today's data... oddly the exact same charge got better the more I shot it 17088177517266220517014824173064.jpg
 
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