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  #1  
Old 07-03-2019, 07:42 PM
Jtbaker1989 Jtbaker1989 is offline
 
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Default 7.7 Jap and .303 British

I recently picked up a nice type 99 Arisaka rifle in 7.7 Jap. Still has the crest on it. Awhile back I got some reloading dies made by Pacific for .303 British. On the package the dies were in it said “.303 British/7.7 Jap”. I plan on making the 7.7 Jap brass out of 30-06 brass but wasn’t sure if these Pacific dies can actually size for the 7.7 Jap. I use them often for the .303 but don’t trust whoever wrote on the package. Thanks for your help.
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Old 07-03-2019, 07:46 PM
Chuck G Chuck G is offline
 
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bullets are the same for both calipers but brass NO.
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Old 07-03-2019, 08:05 PM
Jtbaker1989 Jtbaker1989 is offline
 
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Thanks Chuck. I will be ordering some 7.7 dies
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Old 07-03-2019, 08:05 PM
7,62x51mm 7,62x51mm is offline
 
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Default two early 303 Brit and a 7,7 jap for Lewis m/g

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Old 07-03-2019, 08:08 PM
7,62x51mm 7,62x51mm is offline
 
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Default headstamps 7,7 Jap is their 303 loading for Lewis m/g

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Old 07-03-2019, 09:14 PM
Jtbaker1989 Jtbaker1989 is offline
 
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They almost look identical
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Old 07-04-2019, 06:09 AM
bigwagon bigwagon is offline
 
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The rimmed version of the 7.7 Jap was only used in machine guns, not the Type 99 infantry rifles. Not sure if you can use the same dies for both.
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Old 07-04-2019, 09:53 AM
BRMPCF50 BRMPCF50 is online now
 
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The 7.7x56R is the same as the .303 Brit. Used in aircraft machine guns and Japanese Lewis guns.

Japanese rifles used a 7.7x58 rimless round.

https://en.m.wikipedia.org/wiki/.303_British (scroll down for info on the Japanese version)
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Old 07-05-2019, 03:40 PM
jeremy69 jeremy69 is offline
 
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I just bought the dies and brass from Grafs when I got a 7.7, was not worth the risk to mix the formed 30-06 back in with my real 30-06. I think it was $50-60 for 100.
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  #10  
Old 07-06-2019, 06:54 AM
navyrifleman navyrifleman is offline
 
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The bullets for the .303 British, the 7.7mm Jap, and the Russian "7.62mm" are generally the same.

I cast a 160 grain lead bullet in a Lee mold which was designed for the AK-47's 7.62x39. It comes out of the mold as .312, but can be resized down very easily. This bullet can be used in all of the above as cast. I have found this bullet, sized to .309 to be very accurate in my 30-06 as well.

The 7.7 Arisakas vary a bit in bore size. Consider slugging the bore and checking the exact size with your micrometer, then size your cast bullets accordingly.

You are doing the right thing by getting a set of dies made specifically for the 7.7 Jap. You CAN resize 30-06 brass in a 7.7 Jap die but you will have to trim the neck down afterwards to proper length. I always take a red permanent marker to the bottom of all my resized brass so that I don't accidently mix them in with similarly marked 30-06 brass.

Carefully inspect all your shells after firing. I have a couple of Arisakas which have a tendency to bulge the cases, which leads to a short life for the brass.

The Arisaka is one of the strongest bolt actions, but headspacing and varying chamber tolerances can be a problem.

You may have to refer to some older reloading manuals for load data.

Best of luck with your new rifle.
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