Bubba'd Type 99 chambering

[musketshooter]

300 Savage. Common conversion caliber.

[Sunray]

The 7.7 Japanese bullet diameter when converted to inches is .311". Same as the .303 Brit(which is 7.7x56R). Keeping in mind that the bore is .303" while the grooves are .311".
You need to slug the barrel and do a chamber cast.
Cerrosafe is available from Brownell's to do the cast. Comes with instructions(isn't rocket science anyway), as I recall, and 1/4 pound is plenty. Cerrosafe is reusable too. It's a low melt temperature metal that doesn't look like any metal. You do need a melting pot.
Slugging the barrel is done with a cast .30 calibre bullet or a suitably sized lead fishing sinker, a plastic mallet and a micrometer. You hammer the bullet/sinker through the barrel, preferably from the chamber end, and measure it with the micrometer. Easier to do than describe.

[fguffey]

P.O. Ackley describes shooting 30-06 through a 6.5mm Japanese rifle in his books. Several shots if I remember properly before the bolt locked up.

And I said "to heck with the rifle give me the cases"; and then I asked how is it possible to chamber a 6.5 rifle to 30/06 with a reamer with .300" pilot? If the reamer had a 6.5 pilot the rifle could be considered a 6.5/06 and I ask; how scary is that? Most reloaders are familiar with the 25/06.

The North Texas shooter chambered a 308 W into a 25/06 and the kibitzers were betting on how long the bullet was when it cleared the barrel. And then there was the case; what happened to the case was beyond most members ability to comprehend.

F. Guffey

[Conductor]

I remember reading a short article in the American Rifleman back in the late 1950s about a guy who rechambered a 6.5 Arisaka to 30-06. He took it to a gunsmith, complaining that ever since he rechambered it, the recoil was unbearable. The gunsmith explained to him that he couldn't rechamber a 6.5 to 30-06 because the pilot on the reamer wouldn't fit into the barrel throat. The customer said that he had indeed had that problem, but had turned the reamer down on his lathe until it would fit. The article in the Rifleman had photos of a couple of the bullets fired through the gun, and they were squeezed out until they were about an inch and a half or two inches long.
One point of the article was how strong the Arisaka action is. The other point is how stupid some people are. They didn't call the guy stupid. I think the term they used was "lucky".

[JimF]

I remember reading a short article in the American Rifleman back in the late 1950s about a guy who rechambered a 6.5 Arisaka to 30-06. He took it to a gunsmith, complaining that ever since he rechambered it, the recoil was unbearable. The gunsmith explained to him that he couldn't rechamber a 6.5 to 30-06 because the pilot on the reamer wouldn't fit into the barrel throat. The customer said that he had indeed had that problem, but had turned the reamer down on his lathe until it would fit. The article in the Rifleman had photos of a couple of the bullets fired through the gun, and they were squeezed out until they were about an inch and a half or two inches long.
One point of the article was how strong the Arisaka action is. The other point is how stupid some people are. They didn't call the guy stupid. I think the term they used was "lucky".

Yup . . . .

See “The American Rifleman”, May, 1959, page 52.

[fguffey]

I remember reading a short article in the American Rifleman back in the late 1950s about a guy who rechambered a 6.5 Arisaka to 30-06. He took it to a gunsmith, complaining that ever since he rechambered it, the recoil was unbearable.

A shooter purchased 308 W ammo and then took off for the range with a rifle that had a 25/06 chamber.

F. Guffey