This is a discussion on discussion at Walmart within the Defensive Ammunition & Ballistics forums, part of the Defensive Carry Discussions category; I've seen 40's fired in a 45 at our range also. Same results as posted above. If I get time I'll take a pic and ...
I've seen 40's fired in a 45 at our range also. Same results as posted above. If I get time I'll take a pic and post it.
Just as aside, a 308 should be able to be fired in a 30/06 rifle... there is only 3mm difference in case length. That is not to say it would be safe, but possible. Some rifles such as the Mausers have a positive extraction from the magazine so the extractor would hold the shell with the against the breech face until detonation. I know that I would not want to be around when someone did this, but it is possible, and there have also been reports of someone doing the same with a .270 ; I believe Massad commented on it. Very dangerous practice!!!!
Please read, very interesting and informative... near the end of article.
Last edited by mauser1959; February 11th, 2010 at 07:04 PM. Reason: add link
Thank you for taking the time to write the message you sent. It totally conveys my sentiments and I could not post a better message.
It seems that there are at least two camps on this forum, experienced and unexperienced. It should not be an unpleasant experience on this forum to ask a question from an experienced shooter.
I remember once while my wife and I were shooting at an indoor range. She ws in the next booth and came to me and said " the gun is jambed and won't fire"
She was shooting one of my 9mm pistols. I unloaded the gun and discovered that she had loaded .380. It kind of looks the same but won't fire and jambs.
She had just taken a box out of my ammo bag without looking or knowing the difference.
We fixed the problem and she was on her way again.
There was no shame blame or guilt. Just understanding that she did not understand.
Later I showed her the two different boxes and that even though 380looks similar to 9mm Luger, it is not the same.
Now I put the boxes of ammo on the shooting shelf for her before she loads so there is no mistake.
Some shooters, new and old, need a little help from time to time, so why not try help them if you can.
If you understand, things are just as they are... If you do not understand, things are just as they are....
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I'm sorry but... seriously, what woman would "want" a WWII British .303?
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While we're on the topic, I've had this question for awhile. (I'd never try it, but I am curious.) Can a .308 round be fired in a .308 WIN chamber?
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What do people in this thread mean by 'dangerous'?
A .40 S&W cartridge fired in a .45 ACP chamber (held by the extractor) does not develop full pressure. As soon as the case splits and the bullet leaves the case, pressure pretty much evens out and dissipates. Yes, a .40 S&W develops chamber pressure of more or less 35,000 CUP but only when fully supported and channeled.
The gas is hot and might give a first degree burn, but it's not going to be enough to blow up the gun. It will blow crud (partially burn powder) down the barrel, but that's about all.
A similar condition exists with the .308 Winchester/.30-06 interchange. By the way, the .30-06 is 63mm long and the 7.62x51 NATO is 51mm long; a difference of 12 mm; however, what Mauser 1959 posited is essentially correct. The extractor will hold the shorter round in place very well and it will fire.
Because the longer chamber allows the case to expand radically, the pressure is lessened. The bullet of the 7.62 round will nicely line up in the throat when chambered, so the bullet will enter the barrel and fill out the rifling. I've never chronographed such an event, but I'm sure there's velocity loss.
Is that dangerous? Not in terms of blowing up the weapon. The case is pretty well ruined, but the walls and rear of the case do seal off the rear of the chamber, so gas leakage shouldn't be a problem. The pressure is reduced by the volume factor.
The only possible danger is if the case is just far forward enough in the chamber to slam into the firing pin and puncture the primer. That could send hot gas back through the bolt body, possibly into the shooter's face.
Not what I see as 'recommended practice' by any means, but not what I would term as 'tom fool dangerous', either.
I've seen several 9x19 rounds fired in .40 S&W chambers. Case is ruined, accuracy all over the place and the shooter mystified at the really, really bad functioning. No blowups, no gas leaks, nothing of what I would classify as 'danger'.
.380 ACP in a 9x19 chamber; essentially same results; marginally better accuracy. The cases can usually be salvaged, if anyone cares.
A 'wrong' cartridge is dangerous in terms of catastrophic failure only when the cartridge fits well enough to be seriously confined in the chamber. The 'right' cartridge in a slightly open chamber will generally blow out the web of the case with catastrophic results. (I've seen that happen, too.)
The question of .308 Win in a .303 Brit chamber is interesting. The .303B is longer to the shoulder and longer over all. The head of the .308W case is smaller in diameter and may or may not catch on the extractor. Since the .308 bullet is only about .003" smaller in diameter, the bullet could very well obdurate to bore diameter. However, as with the .30-06 chamber, the .308W case will expand out and drop some pressure in that process. In any event, the .303B SMLE has been rechambered to .308W without terrible results.
Again, not anything I'd recommend, but I doubt it disastrous.
I would also re-emphasize the words of Hoss and SIG. Shooters who simply don't know better need information and education, not laughter. I know what I know from over forty years of doing this. When I started, I thought the 'German Luger was the most powerful gun in the world'. Someone gently taught me better.
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The 270 will chamber and can be fired from a 30-06 but a 30-06 will not chamber in a 270 (I tried cause I was curious). Even if it did I wouldn't try firing it.
Since calibers come from parent cartriges some rounds would chamber in the incorrect gun. Its not safe unless you reload and know what you are doing it gives reloaders options like...
A 308 can be necked down to a .243
a 30-06 can be necked down to .270
a 30-06, 308 or 270 can be cut and resized into .44 automag
a .223 can be necked up to a 300 whisper
There is something about firing 4,200 thirty millimeter rounds/min that makes me feel all warm and fuzzy inside.