oops! 7.65 Argentine ammo in a type 99 arisaka !!!

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tark

tark

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Oops! Grabbed a stripper clip of Arisaka ammo and stepped out the back door to do a little shooting. Popped off five rounds and when I went to retrieve my brass....oops. I had fired 7.65 Argentine ammo in the gun! Being a controlled feed action, the gun had fed the rounds out of the mag, held by the extractor, chambered and fired them without incident. Accuracy was good because the bullet was the proper .311" diameter..

This is probably not a good idea, and I certainly do not recommend anyone try this. It was an interesting unintended experiment.
 

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I had once contemplated filing 2 full threads off the back of type 99 barrel so it could use 765. I dont think it would even need a reamer. The availability of new 7.7 brass stopped that from happening.
 
Yes. 7.65x53mm Mauser in a 7.7x58 Arisaka is analogous to firing .308 Winchester in a .30-06 chamber.
Code: 
 7.65×53mm Mauser
Neck      0.346 in
Shoulder  0.429 in
Base      0.473 in
Rim diam  0.474 in
Rim thick 0.039 in
Case      2.110 in (53.60 mm)
Bullet    0.313 in


 7.7×58mm Arisaka
Neck      0.338 in
Shoulder  0.430 in
Base      0.473 in
Rim diam  0.475 in
Rim thick 0.039 in
Case      2.280 in (57.8 mm)
Bullet    0.312 in
I would not reload the fired casings because there's not enuf neck left for consistent neck tension on the bullet.
 
Carl N. Brown said:
Yes. 7.65x53mm Mauser in a 7.7x58 Arisaka is analogous to firing .308 Winchester in a .30-06 chamber.
Code: 
 7.65×53mm Mauser
Neck      0.346 in
Shoulder  0.429 in
Base      0.473 in
Rim diam  0.474 in
Rim thick 0.039 in
Case      2.110 in (53.60 mm)
Bullet    0.313 in


 7.7×58mm Arisaka
Neck      0.338 in
Shoulder  0.430 in
Base      0.473 in
Rim diam  0.475 in
Rim thick 0.039 in
Case      2.280 in (57.8 mm)
Bullet    0.312 in
I would not reload the fired casings because there's not enuf neck left for consistent neck tension on the bullet.
Click to expand...
Arisaka cases & chambers are actually several thousandths larger. Just enough to split a case. Cases formed from 06 brass will split w max loads. Very shady practice.
 
Bcwitt said:
Not really. 7.7 is slightly larger. I split a case just like that.
Click to expand...
Then you have an Arisaka with an oversized chamber.
Bcwitt said:
Arisaka cases & chambers are actually several thousandths larger. Just enough to split a case. Cases formed from 06 brass will split w max loads. Very shady practice.
Click to expand...
There is only .002" difference between an 06 case and a 7.7 case, measured at the base. Not enough to worry about. A type 99 with a normal chamber will work just fine with cases made from 06 brass. I've been doing it for years.
troy fairweather said:
It's a 7.99 lol, I've Hurd stories of when guys couldn't find ammo for the 7.7 they shot what ever would fit.
Click to expand...
I have fired a lot of .308 / 7.62 NATO out of my 99. As long as you make sure the extractor has a firm grip on the case , this is perfectly safe. The bullet makes a long jump from the case to the leade which probably lowers pressures quite a bit as does the rapidly expanding interior space in the case. Accuracy with a .308 bullet in a .311 bore is not too bad, at least in my gun.

Most 99s won't accept a 308 round. The bolt won't quite close. The Arisaka round is slightly tapered. 308s are a straight case and the forward edge of the straight case will usually wedge in the chamber, just enough to prevent closure. The remedy to this is to run the loaded 308 round into a 7.7 full length die. ( with the de-capper removed ) The case will again wedge itself in the chamber, but the bolt will now close. In effect, the case is now head spacing on the slightly squeezed down portion of the case.
 
tark said:
Then you have an Arisaka with an oversized chamber.

There is only .002" difference between an 06 case and a 7.7 case, measured at the base. Not enough to worry about. A type 99 with a normal chamber will work just fine with cases made from 06 brass. I've been doing it for years.

I have fired a lot of .308 / 7.62 NATO out of my 99. As long as you make sure the extractor has a firm grip on the case , this is perfectly safe. The bullet makes a long jump from the case to the leade which probably lowers pressures quite a bit as does the rapidly expanding interior space in the case. Accuracy with a .308 bullet in a .311 bore is not too bad, at least in my gun.

Most 99s won't accept a 308 round. The bolt won't quite close. The Arisaka round is slightly tapered. 308s are a straight case and the forward edge of the straight case will usually wedge in the chamber, just enough to prevent closure. The remedy to this is to run the loaded 308 round into a 7.7 full length die. ( with the de-capper removed ) The case will again wedge itself in the chamber, but the bolt will now close. In effect, the case is now head spacing on the slightly squeezed down portion of the case.
Click to expand...
tark said:
Then you have an Arisaka with an oversized chamber.

There is only .002" difference between an 06 case and a 7.7 case, measured at the base. Not enough to worry about. A type 99 with a normal chamber will work just fine with cases made from 06 brass. I've been doing it for years.

I have fired a lot of .308 / 7.62 NATO out of my 99. As long as you make sure the extractor has a firm grip on the case , this is perfectly safe. The bullet makes a long jump from the case to the leade which probably lowers pressures quite a bit as does the rapidly expanding interior space in the case. Accuracy with a .308 bullet in a .311 bore is not too bad, at least in my gun.

Most 99s won't accept a 308 round. The bolt won't quite close. The Arisaka round is slightly tapered. 308s are a straight case and the forward edge of the straight case will usually wedge in the chamber, just enough to prevent closure. The remedy to this is to run the loaded 308 round into a 7.7 full length die. ( with the de-capper removed ) The case will again wedge itself in the chamber, but the bolt will now close. In effect, the case is now head spacing on the slightly squeezed down portion of the case.
Click to expand...
Really? How much is enough to worry about?
 
tark said:
You mentioned that you split a case that was formed from 06 brass. That is enough to worry about.
Click to expand...
I know ive said this before but only one of my half dozen or so brands of 06 brass has mic'd .470 at the base, most was .464-.468, and the ppu and Winchester 7.7 brass all mic'd .473

Just checked a .270win and .280hormady case and both mic'd .467
 
Reminds me of my reamed out Arisaka. Normal 7.7 brass looks like that brass when fired through it.
After a whole thread discussing what caliber it could've been rechambered too, i came to the conclusion someone either was reaming it to a caliber but stopped halfway or wanted to make a wildcat caliber.
 
last Sunday watched a guy shoot 270 win out of an 30:06. Brand new rifle, the box it came in said 270 but barrel was 30:06. didn't hurt anything but accuracy was terrible. bullets tumbled at 100yards.
 
LoonWulf said:
I know ive said this before but only one of my half dozen or so brands of 06 brass has mic'd .470 at the base, most was .464-.468, and the ppu and Winchester 7.7 brass all mic'd .473

Just checked a .270win and .280hormady case and both mic'd .467
Click to expand...
An interesting point, LoonWulf. Cartridges of the world lists the 06 at .470 and the 7.7 at .472. I just mic'd an 06 round at .468 and another one ( different brand ) at .466. My PPU 7.7 ammo is consistent at .471. I guess my type 99 just has a nice, tight chamber. It left the factory with all the bells and whistles but now the monopod, aircraft sighting wings and bolt dust cover are gone. Still has the cleaning rod and the chrome lined bore.
 
That's like me on my 1st mule deer hunt in '72. I brought a 7 mag and a .25-06. I missed my 1st shot at a nice muley I jumped with the 7 mag and the bolt came out of the Weatherby Vanguard when I tried to jack in another shell. I fumbled around and finally got the bolt back in and somehow chambered a .26-06. The neck was still there but the body had 2 long splits down the whole length. The muley stopped and looked back at about 80 yds and I shot him with the .257 bullet. After a short tracking job, I found him dead.

Accidents and miracles happen.
 
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