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3" APT (or perhaps APCBC-T) projectile, but from which country?

ogreve

Well-Known Member
Hi,

I'm specialising in medium and large calibre Japanese stuff. I may have a chance at a (part of) an APT or more likely APCBC-T projectile, which would be interesting for me if it's a Jap one. It doesn't look at all like a WW2 Jap one, but perhaps it's from the Russo-Japanese war era.

I asked some very knowledgable people on US and Russian ammo too, and neither of them could positively identify it as being from those countries, though Tony Williams just e-mailed me that it resembles the US 3 inch M79 one, but that that one is longer.

With some of these most likely alternatives probably eliminated, it's driving me crazy what it's origin might be. It may be early Jap or Chinese, or perhaps foreign manufacture for Japan; most likely then British, French or German.

The only two markings on it both appear at the bottom, and they are an arrow (not a British broad arrow) and the number '18'. Maybe someone recognises it from the description and/or the pictures, or maybe from the general style of the projectile?
The bottom engravings, may be tell-tale, but I just need to come across the right person who recognises them. :tinysmile_eyebrow_t

Some further details (coming from an e-mail I previously sent about it):

The calibre is given as being 3" but it could of course also be
something else in the 75mm - 77mm range. The length is between 8" and
8.5" and the only markings that can be made out, are on the very
bottom, being a short arrow (pointing inwards, to the centre of the
projectile) and the number '18' right next to it.

It came along in a batch of military Jap stuff brought back by a US
WW2 veteran. I went through my docs on both IJA and IJN ammo, and
don't see it anywhere... In IJN ammo I don't see any AP ammo at all in
the calibres around 3". In IJA ammo, there are two 'AP' projectiles
that I have documentation on, but they're both of the APHE kind and
have different shapes (boat tailed, etc.).

The projectile may still be Japanese, as the documentation I have
isn't always complete, but it certainly doesn't look like a typical
Japanese AP projectile, at least not of the WW2 era.

The straight base, without crimp and without boat tail, as well as the
short profile suggest it might be older than WW2, possibly from the
Russo-Japanese war, but it might also have been manufactured by a
different country (most likely USA in that case), and it might have
been capped.

O.k., thanks for taking the time to read this message, and hopefully someone can identify it or at least its origin,
Olafo
 

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Hi,

Thanks a lot for your answer and the drawing!
It does indeed look very close. The drawing shows a slight boat tail, whereas the one I'm after looks straight. I wonder if the drawing is accurate enough...
Does anyone perhaps have a picture of such an M72 projectile?

Cheers!
Olafo
 
Case fixing ?

I notice that your 75mm also has no "crimping" groove to attach to the case, so presumably the case might attach over the lower half of the driving band ???
 
hi,

By e-mail I just received the verdict that it is definitely not the M72 one as that one has a boat tail and is 9.2" tall... This is coming from a collector who's specialised in US ammo, so even though in several respects it looks like a US one, I'm still thinking that he would have recognised it then...
Several people who are very knowledgeable about UK ammo have made no mention of it resembling a UK one...
Sooo, with the plot far from thickening, all sorts of options are open still...
I do keep thinking that the overall shape and short straight crimpless base might well indicate it being older than WW2... Not sure, of course...

Anyone who has a clue as to where it could be from?

Cheers,
Olafo
 
hi,

I don't think I have complete enough docs on US ammo... I have NavSea Op1664 and checked it earlier today but I didn't see anything that fits the bill. Does anyone perhaps have a -preferrably online- reference that shows these projectiles well?

Also: I know preciously little about French ammo, but I do think the French sold ammo to Japan early in the previous century, perhaps this is one of them??? Perhaps the 18 indicates 1918 with it being a WW1 leftover sold to Japan??

Cheers,
Olafo
 
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A p !

So the plot thickens !
As previously stated I think that your projectile may have been attached to a case that could be crimped into the central groove in the driving band.
I strongly suspect that it is purely an "Armour Piercing" and not "AP Capped" as even though it appears to have struck a soft target (beach sand/sand butt or similar) there is absolutely no trace I can see of any soft solder or other medium to attach a cap/windshield.

Another point is that it has a very deep Bourellet which is indicative of first W.W. produced shells, possibly bourne out by the stamped numbers on the base.
Tracers were not a big thing during the first world war, so another mystery.

Sorry that this answers none of your questions and just adds to the mystery.

Very interesting shot !
 
As Bombsaway1980 has said, what you have is an M339 AP-T projo. Your projo doesn't have a crimping groove below the band, because the case fits over most of the rotating band, and the case crimps in the groove in the middle of the larger part of the band. When you look at the fired band, you can see that it is divided into 3 pieces, a small part at the top, which actually rests on the top of the case mouth, and the rest of the band (most of) the band, which is all inside the case. I have shown a closeup of the drawing in the manual which shows the case crimped over the projo band.

This projo was fired by the M41 Walker Bulldog tank. It is usually shown with an aluminum windscreen glued on the front, but I have examples of the projo without windscreen.

There are only three larger caliber projectiles used by the U.S. that use this case over band cartridge design, this one, the 76.2mm Otto Malera rapid fire gun that was used by the U.S. Navy on their hydrofoil, and the 3 inch 70 cal gun used on a couple of aircraft carriers.

John
 

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3" ap?

Greetings All,

My 2 bobs worth!

johanes pic in his old post looks like a 75mm APCBC PAK51 used in some French AMX tanks missing d/bands & caps. Not the same as mystery proj, as it has a crimp groove below d/band & no bourolet.

Definately not a M72 AP- 1 d/band, boat tail & a crimp groove.

The M339 is the closest thing yet to the mystery proj. My money is on that one! Even though in the paperwork there is no gap between the top d/band & bourolet, but on mystery one there is??? As previously mentioned, this style if any tracer was not common in WWI or earlier.

Good luck Ogreve.:tinysmile_shy_t:

Regards Ozzi.
 
If you still have doubts and don't believe me, I can send a photo of 4 or 5 fired ones that look just like yours. U.S. projos are reduced in diameter between the rotating band and the bourrelet, and that is a U.S. tracer in the base.

John
 
If you still have doubts and don't believe me, I can send a photo of 4 or 5 fired ones that look just like yours. U.S. projos are reduced in diameter between the rotating band and the bourrelet, and that is a U.S. tracer in the base.

John


Hi John,

I do believe you, but would certainly appreciate seeing such photos; they would prove very useful for restoring the projectile which, incidentally, indeed was swooped up by me. Paid $50 for it, which may be rather high, but I didn't want to lose out on it in case it really were Japanese. Oh well, such is life, I guess...:tinysmile_eyebrow_t

Anyway: I'm looking forward to seeing some pictures of the real projectiles. Also, to ask the obvious, I guess the length of some 8" - 8.5" for the shot part is correct too then?

Cheers, and thanks in advance,
Olafo
 
I will shoot some photos and take measurements. I have fired ones like yours and unfired ones. Just so you don't get shorted on Jap stuff again, go here and download the U.S. manual on Jap Ordnance Projectiles:

Thanks!
Looking forward to seeing the pictures....
As for the docs on Japanese ammo: yes Lex Peverelli is well known to me. :xd:
I have a.o. a more complete version of the same manual, under the title "NavSea OP 1667", which is just about my "bible" on Japanese ammo, along with Ken Elks' great book. I have some 8 further titles on Jap ammo, but keep coming back to those two for checking stuff.
I knew in advance that the projo wouldn't be a WW2 era Jap one (which is the field covered best in all of my docs), but that it might just perhaps be an older one (a field, virtually not covered at all by my docs). Anyway. You win some, you lose some. I just hope I didn't have a particularly bad buy at $50. :tinysmile_cry_t2:

Cheers!
Olafo
 
I think they got you, most times after a range clearence we have a pile of over 100 AP projectile 37, 57, 75, 76, 90 and 105mm.
 
I think they got you, most times after a range clearence we have a pile of over 100 AP projectile 37, 57, 75, 76, 90 and 105mm.


Hi,
Darn.... not the answer I would like to have heard... Anyway, I may then decide to not get it across to Europe just yet, as the postage will further add to it.

Cheers,
Olafo
 
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