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90mm HESH M691 questions

917601

Well-Known Member
US 90mm HESH ( HEP) questions

Did the US use a 90mm HESH ( HEP) round in Vietnam or that era? I can find no information anywhere...and what was the proper case? Steel, Brass? I saw a demilled rusty one sitting in a steel lacquered case, dated 1969.
 
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The U.S. made test samples of HEP-T projectiles in a variety of calibers. HESH is a British term. I have seen HEP-T projectiles in 75RR, 75mmG for the Sherman, 76mm for the Walker Bulldog, 90mmG, 105mmG, 105/106mmR and 165mmG. I've never seen any fixed round data in any manuals for the 75G, 76G or 90G rounds. The 75R round was only shown in one printing of one manual.
 
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Lifted from the net. Identified as a 90mm HEP-T M385....the one I am looking at is the same, but rusty and 1/2 inch torch cut on the nose. Markings on the rotating band not readable. ( LOT xxx- M T 14253-19) but "not for certain."

Added source: http://thefrugalcannoneers.weebly.com/projectiles.html
 

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The U.S. made test samples of HEP-T projectiles in a variety of calibers. HESH is a British term. I have seen HEP-T projectiles in 75RR, 76mm for the Walker Bulldog, 90mm, 105mm, and 165mm. I've never seen any fixed round data in any manuals for the 76mm or 90mm rounds.

If there is no load data manual for this round, it should not have an "M" number designation? If a test model, should it have a " T" number?
....I just may have to spend a hundred bucks and change to take possession,....a little welding, bondo, paint, and let it sit until I can find out the proper designation.....the alternative is it just may get pitched into the scrap metal pile.
 
Your question is valid. Your sources are the problem. If you look closely at the photo you attached, you will find a number of things that are wrong: The lettering is repainted, and in the wrong place, it should be lower on the projectile. Proper color codes for HEP-T projectiles are all black body (anti-armor) with white lettering for inert, all black body with yellow lettering for HE, OD green body with blue band for practice, or OD green with yellow lettering and black band for HE (anti-armor). The explosive fill on HEP-T projectiles is never Comp-B. HEP-T projos use a plastic explosive Comp A or Comp A3. When people repaint things, they sometimes fabricate their own model (M) numbers and lot numbers.

The next thing to consider, is that in some instances, a projectile body will be stamped in the body with one number, which is the part number for the body, and it will be assigned a completely different Assembled Cartridge number, which is the inked on lettering on the loaded shell. The lot number of the loaded assembly will be a different number than the lot number of the metal body and the lot number of the fuze or the lot number of the cartridge case.

I have examples of 75G, 76G, 90G, 105H, 105G, 105R and 106R (same projectile), and 165G projectile bodies. In addition the 105G WP-T projectile body is the same as the HEP-T but is stamped with a different number. The 105 G and 165G projectiles are more recently produced and were produced by Norris Industries (NOR). The 105R/106R body was produced in 1955 by Chamberlain (CC or YCC). It is stamped with a T number but assembly lettered with M346.

All of the rest of the projectile bodies were manufactured in 1952 or 1953 by Chamberlain. It appears that HEP-T projectiles were tested in almost every Gun or Rifle available at the time. Below is a list of Metal body part numbers stamped into the metal and the years they were manufactured. You will notice that the 90G body has numbers similar to what you have been told of the one you are thinking of buying which is very overpriced at $100.00 for a rustball;

75G T165E11 1952 (For Sherman)
75R T151E22 1953 (Recoilless)
76G T170E3 1953 (Walker Bulldog)
90G T142E3 1952 (Guns)
105H T81E28 1952 (Howitzer)
105R T139E45 106R T139E47 1955 (Recoilless rifles 105 and 106mm) Both numbers stamped on the same body.

Assuming you end up with a projectile, you should look for a case around 1952/1953 timeframe with the same date on the primer.

By the way, your title (M691 HESH) is a European Mecar manufactured round for a low-recoil gun. Not even related to U.S. Ordnance.
 
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Thank you for your assessment and information. Your list of body numbers and dates is/will be most helpful.
 
I did pass on the rust ball, but found and bought another one in better shape, with appears to be black lacquered paint that is worn. ( $55)....it is marked above the driving band, " Lot YCC 1-13- HEP 90 MM T142E3 1952" . I can not find in the TMs what case number it would take. I have a 60's dated unfired steel lacquered case date 62 and marked "XM 200"....which I found is correct for the APERS. Keep in mind I am a novice collector ( hooked) and haul this stuff out to airshows, events, etc....for displaying different "types" of ordnance but am striving to build a technically correct collection as I can.
 
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A picture of my 90mm HEP. What color should it be, black or OD? Engraved, "Lot YOC -1-13-HEP 90 MM - T142E3 1952". I found from the web a reference for the lettering but it does not mention the color. Your previous post stated black, I wanted to make sure before I fill the dent and repaint it. The reason for repainting it- I have a 90mm shell casing in new condition and want to try inking the lettering.
 

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High Explosive loaded HEP-T projectiles should be painted OD green with a 2 inch wide black band around the body about 1-2 inches below the ogive. All lettering should be yellow.

Where did you get the drawing of the projectile? Do you have a drawing in any better condition?

Double check your lot number. YCC would be Chamberlain, which manufactured a lot of projectiles.
 
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High Explosive loaded HEP-T projectiles should be painted OD green with a 2 inch wide black band around the body about 1-2 inches below the ogive. All lettering should be yellow.

Where did you get the drawing of the projectile? Do you have a drawing in any better condition?

Double check your lot number. YCC would be Chamberlain, which manufactured a lot of projectiles.

Hazord,
You are correct, the three letter lot is YCC. My source: a Google image search, " 90mm hep T142e3", first two images popped up ( from " War Thunder Forum). The first image ( shown below) was blurry as well. Thanks for the reply.
 

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You are welcome! When I worked at Norris Industries, Chamberlain (YCC) was our competition.
 
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