2/19/2023 0 Comments 6.5 jap accuracy![]() ![]() If that is the case then I would anticipate a problem if you just chambered a 30-06 round in a 7.7mm Japanese rifle. While I have not converted 30-06 to 7.7 Japanese ammo, my understanding is that the 30-06 round needs to be shortened considerably (which is why some folks like using the 8x57 Mauser round, as it is shorter). In fact the accuracy loss at 100 yards has been minor (say 4 inch group of 5 shots rather than a 3 inch group). ![]() I have shot jacketed remington 180 grain bulk 0.308 bullets in a Russian 7.62x54 R MN rifle, which has roughly the same 0.311 bore that a Jap 7.7 mm rifle has, with absolutely no ill effect. The 7.7x58 cartridge will do anything the 30-06 will do. Brass is also available for reloading, so there is no real reason to make a cartridge conversion any more! Now I peronally hate to see any Japanese rifle "sporterized", but if Bubba has already gotten to a Japanese rifle, there is no harm done by finishing the job, and making a decent hunting rifle out of it.Īlso note, 7.7 Japanese ammo is now being imported by Graf's, at less than $20 a box retail (and in the $16 per box range if bought directly from Graf's). ![]() But any decent gunsmith could lengthen the magazine well to handle a factory loaded 30-06 cartridge. Unless you hand load your own 30-06 ammo, and seat the bullets deeper into the case, you will have problems getting a 30-06 cartridge into the T99 magazine well. I now make 7.7x58 cases out of 8x57 Mauser brass, only because it is less work. I have made many hundreds of 7.7x58 Japanese cases out of 30-06 brass, and never had a single one rupture at the base. Heck, the US Government rechambered about 50,000 T99's during the Korean War to arm Korean troops. There is nothing bad or dangerous about rechambering a Japanese T99 to 30-06. ![]()
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