Deep seating 7.62x25 dangerous?

fightinghamster

fightinghamster

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Seen a post about a 7.62x25 conversion barrel for a 9mm 1911 and it got me thinking about buying one, however because the magazine is shorter for the 9mm the 7.62 won’t fit out of the box and the bullet needs to be pressed deep into the case, obviously the way to go is to reload for the 7.62 and get the bullet seated properly with the proper powder load behind it but I’m wondering about the dangers of using standard norinco non corrosive ammo and seating the bullet deeper into the case, will the pressure be too high ? Am I in danger of an impromptu pipe bomb? Any information on the subject is appreciated
 
I wouldn't do that. You will definitely raise pressure -although I have no idea how much. If you are going to do that I would pull the bullets, reduce the powder charge and work up. Assuming the deeper seated bullet will still hold in the case mouth and function. But that pretty much defeats the purpose of using cheap surplus ammo.
 
https://www.shootingtimes.com/editorial/converting-a-1911-to-7-62x25-tokarev/99440
Figure-4-7.62x25-Tok-Conversion-Brad-Miller-300x173.jpg
Converting a 1911 to 7.62x25 TokarevThe 7.62x25 Tokarev is longer than the usual semi-automatic rounds for American handguns. The maximum length of the 7.62x25 Tokarev is 1.386 inches (35.20mm). That's 0.106 inches longer than the .38 Super's 1.280 inches. This additional length poses a problem because a 1911 frame and magazine are not designed for a cartridge as long as the Tokarev and this limits how many rounds will fit in a .38 Super magazine. One of my 10-round Chip McCormick .38 Super magazines would only accept four rounds of the Tokarevs, while another magazine would only accept five rounds.
Click to expand...

You can use 38 super mags in some 1911s, so maybe you could find a mag that works with 5 or more factory rounds. I could be wrong of course.
 
The VC converted some captured 1911's to 7.62x25 and Stens were also converted in the Korean conflict but I believe different mags from a Soviet SMG were welded on those.
 
Gatehouse said:
I wouldn't do that. You will definitely raise pressure -although I have no idea how much. If you are going to do that I would pull the bullets, reduce the powder charge and work up. Assuming the deeper seated bullet will still hold in the case mouth and function. But that pretty much defeats the purpose of using cheap surplus ammo.
Click to expand...

That’s my thoughts I’ll probably just go with a 40cal conversation and keep the 7.62 for my tokorev
 
That was Ganderite posting about his 1911 conversion, also mentioning that he handloads ammo for it with an appropriately smaller powder charge for the deeper bullet.

Simply pressing factory ammo deeper would NOT be recommended and would cause dangerous overpressure.
 
I load for a 1911 in 7.62x25

Milsurp ammo has 2 problems:

- The primers are so hard that even with a heavy hammer spring, I get 50% first strike ignition
- The OAL is too long to fit the 38 Super mag, unless the bullets are seated a bit deeper.

I have a few cases of different brands of milsurp ammo. They range from 1400 fps to 1200 fps. I used the 1200 fps stuff to seat the bullets deeper. They seem to work ok. but the ignition problems kill the idea.

Only handloads for the 1911 with commercial primers.

For milsurp ammo I use Toks. I have Russian military, Chinese military, Norinco and the Polish. The Polish is an excellent, quality gun with very good accuracy.
 
I converted a 9mm Para Ordnance to 7.62x25. The mags in the Para 9-18 are long enough for 45 ACP so surplus ammo just need to be seated a tiny bit deeper to fit. The Czech stuff I use (BX25?) has that asphalt sealer which becomes REALLY hard with age - leading to pretty well gluing the bullet to the case. When you reseat the bullet a tiny bit, you actually get a distinct crack as your break the seal of the asphalt. The paradox is that the rounds actually show less pressure because the act of breaking the asphalt seal lets the bullet launch easier, even though you've slightly decreased the case capacity by seating the bullet deeper.

Having learned this trick about breaking the asphalt seal by seating the bullet deeper I now sometimes seat the bullets of surplus ammo a bit before I pull bullets with an RCBS collet bullet puller. The bullet removal is much easier after you have first defeated the asphalt seal.

Note, this only works when you are shortening 7.62x25 a tiny bit to fit a 45 ACP/ 38 super length mag (as in a 911 type frame, etc.). If you shorten surplus 7.62x25 to fit a 9mm mag, you'll have to dump and rethrow the powder to use less than the original amount or you will be into unsafe pressures.

Note: in some 7.62x39 surplus ammo, breaking the asphalt seal by seating the bullets a tiny bit deeper will also reduce group sizes - I suppose because the ancient, hardened asphalt may be leading to inconsistent neck tension.
 
steelgray said:
I converted a 9mm Para Ordnance to 7.62x25. The mags in the Para 9-18 are long enough for 45 ACP so surplus ammo just need to be seated a tiny bit deeper to fit. The Czech stuff I use (BX25?) has that asphalt sealer which becomes REALLY hard with age - leading to pretty well gluing the bullet to the case. When you reseat the bullet a tiny bit, you actually get a distinct crack as your break the seal of the asphalt. The paradox is that the rounds actually show less pressure because the act of breaking the asphalt seal lets the bullet launch easier, even though you've slightly decreased the case capacity by seating the bullet deeper.

Having learned this trick about breaking the asphalt seal by seating the bullet deeper I now sometimes seat the bullets of surplus ammo a bit before I pull bullets with an RCBS collet bullet puller. The bullet removal is much easier after you have first defeated the asphalt seal.

Note, this only works when you are shortening 7.62x25 a tiny bit to fit a 45 ACP/ 38 super length mag (as in a 911 type frame, etc.). If you shorten surplus 7.62x25 to fit a 9mm mag, you'll have to dump and rethrow the powder to use less than the original amount or you will be into unsafe pressures.

Note: in some 7.62x39 surplus ammo, breaking the asphalt seal by seating the bullets a tiny bit deeper will also reduce group sizes - I suppose because the ancient, hardened asphalt may be leading to inconsistent neck tension.
Click to expand...

That’s an interesting piece of information, I didn’t know that an asphalt seal was a thing, so far in my tokorev I’ve been shooting norinco white box non corrosive, it’s copper colour and I have no idea what the pressure in them is however
 
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