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Discussion Starter #1 (Edited)
Blowing Up a T99

Topic:



Topic author: rcb
Subject: Blowing Up a T99
Posted on: 06/02/2005 4:55:19 PM
Message:

Last year I carried a special tube to safeguard in attempting to see how much a T99 could stand. The hottest load I had was 33 grs. of Unique. Had to knock the bolt open but no damage to the rifle. This past weekend I carried 7 load made up in formed brass that had been fired at least once.

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The first cartridge with no tape on it was filled with 53 grs. of 3031 behind a 175 gr. Speer .313" bullet. When fired the primer disappeared and the primer pocket enlarged. Cartridge No. 2 10 gr. of Bullseye pistol powder behind the same bullet. Primer backed out some but could open the bolt and fired case was ejected. The same thing happened with cartridge No. 3 which was loaded with 20 gr. of Bullseye. Cartridge No. 4 was loaded with 25 gr. of Bullseye. No trace of primer was found, pocket enlarged and jamed the extractor. I took it off and the keeper band also. Punched the case out with a cleaning rod. Cartridge No.5 was loaded with 30 gr. of Bullseye, case cracked above head. Had to hammer the bolt open and knocked the case out with a cleaning rod.


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Case No. 6 was loaded with 35 gr. of Bullseye. The head disentrigated and we had to use a sledge hammer to get the bolt open. It would not go back in the action. Lugs were set back on the bolt and in the receiver. I used a tap to get the case out.

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As you can see the bolt head is messed up. The 35 gr. load almost welded the bolt in the receiver. It could not be forced back in. This shot cleaned all the rust out of the safety pipe.

Rick Veal let me have another barreled action for my last cartridge. I was loaded with a compression load of 40 grs. of Bullseye.



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When that round fired it spit the barrel out the front of the pipe onto the ground. The bullet was found about half way down the barrel. We pushed it back out with a cleaning rod. It miked .300 to .312"

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It opened the receiver and let the barrel go. The bullet could not move fast enough to get out of the barrel. The bolt knocked out fairly easy but it tore up the end of the bolt

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Again the case had to be extracted with a tap and cleaning rod.


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This is what the bullet looked like. The first action was a series 6 and the second was a series 20. Both barrels would screw back into a good action. The last shot sheared the bolt handle but it could have been weakened by having been bent. The front lugs and the shoulder in the receiver both moved back letting the bolt handle contact the safety lug, moving it back some and turning the edge out.

I beleive one can quit worrying about the strength of Japanese rifles of WW2. With recommended loads out of a reloading manuel they are safe. No one should attempt this experiment unless they have a very safe container to fire the rifle in. rcb.



Replies:

Reply author: Gregg
Replied on: 06/02/2005 5:10:58 PM
Message:
EXCELLENT! report.
GRegg

Reply author: gwsiii
Replied on: 06/02/2005 5:13:35 PM
Message:
Excellent! RCB please leave the tube somewhere accessible on Friday night next year, I think the next 'challenge' for 'lil Drinkin Buddy' and I would be to see what it would take to blow the tube up. Just kidding, once again, excellent study. Trey

Reply author: CW
Replied on: 06/02/2005 5:25:56 PM
Message:
Nooo! That's the bolt I need for my mismatched rifle!!
All kidding aside, very informative experimentation. Do you plan on challenging a Type 38?

Reply author: BIG ED
Replied on: 06/02/2005 5:54:54 PM
Message:
Excellent study Roy. How about trying a trainer.Which is probably how the "myth" started.

Reply author: GUN HO
Replied on: 06/02/2005 5:58:47 PM
Message:
How about a trainer rifle that would be sweet.

Reply author: davef
Replied on: 06/02/2005 6:05:08 PM
Message:

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Reply author: davef
Replied on: 06/02/2005 6:12:06 PM
Message:
heres a few more veiws of test gun,,,Id like to try a trainer and find a away to try a t-99 with a stock attached,,maybe use a cut down bubba stock to see the effect on a stock during catastrophic breech failure,to better judge injury potential when the metal blew out....Dave

Reply author: BIG ED
Replied on: 06/02/2005 7:39:31 PM
Message:
How about forget the tube and get a lawyer to pull the trigger.

Reply author: GUN HO
Replied on: 06/02/2005 7:52:03 PM
Message:
Yea!
I just got $crewed by one


Reply author: 03man
Replied on: 06/02/2005 8:03:16 PM
Message:
I was fortunate to take a few picts also, I wish I had one of the faces of the on lookers when we realized that the barrel was laying on the ground!

I agree with RCB, one probably can't open the bolt long before any mechanical failure; in fact, the failures were due to case failure and dumping of the hot gases into the receiver. Brass gives before steel.


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Separated case in picture above, and pieces found in test chamber below:

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bolt still locked in position, barrel on ground about 2 ft away! Bullet had traveled approximately 1 ft down barrel, if we assume a speed of 3000 fps, it took only 1/3000 of a second for the cartridge to fire, the case to fail, and the barrel to move!
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Barrel on the way out!
And last but not least the inventor of the test chamber "riceone".

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Reply author: rcb
Replied on: 06/02/2005 8:21:39 PM
Message:
Since the last bolt belonged to Rick I noticed as I gave him the pin, sping and safety, a burnt place where gases hit the pin through the hole in the bolt. Wish I had a picture of that. Must have been terrific pressure to made a spot on the firing pin. rcb.

Reply author: BIG ED
Replied on: 06/03/2005 5:24:28 PM
Message:
Roy,
How about a carcano test? They also seem to have a bad reputation.I don't believe there's anything wrong with them either.

Reply author: rcb
Replied on: 06/03/2005 6:09:07 PM
Message:
Carcano would be a good one and also the Japanese trainer. I don't have a trainer or Carcano to sacrifice. Any one have either or both I would be happy to load up cartridges for next year. rcb.

Reply author: GUN HO
Replied on: 06/03/2005 6:24:46 PM
Message:
I was thinking the same thing a Carcano 8mm,you can get the guy that posted his messed up face from shooting a 8mm carcano ,to test some hot loads, no tube necessary.

Reply author: mackatpanamared
Replied on: 06/07/2005 7:06:59 PM
Message:
i have a boltless 8mm carcano id like to finish off that pic of the guy without the teeth and the big hand is no firearms accident that pic has been floating around the web for a while i first saw it 3 or so years ago on a fireworks site

Reply author: GUN HO
Replied on: 06/07/2005 8:59:25 PM
Message:
One f up looking dude


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