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US 155mm Howitzer projectiles


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#1 DocCasualty

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Posted 28 August 2011 - 03:25 AM

As the US progressed into WWII, the M1918 "Schneider" 155mm Howitzer was gradually replaced by the M1 155mm Howitzer, though I understand the Schneider continued to see service throughout the war. The standard HE projectile for the Schneider (pre-war) was the M102 and for the M1 was the M107. I understand one of the differences between these two projectiles was that the M107 had a wider rotational or driving band. I could swear I remember reading somewhere that the M1 fired the M102 okay but there was some loss of accuracy as compared to the M107 due to some size difference (possibly the driving band?). Conversely, I thought I remembered that there was a problem firing the M107 through the Schneider due to some size difference in shell, chamber or possibly tube size? Now I can't seem to find any reference that suggests that there was any compatibility problems with ammunition between these two Howitzers. Does this sound familiar to anyone or did I just have a brain fart?



"Artillery adds dignity to what would otherwise be a vulgar brawl." - Frederic II of Prussia
"In 9 months and 3 days of combat on the Continent the 949th FA Bn had fired 51,000 rounds of ammunition, approximately 2,550 tons." - Unit History


#2 DocCasualty

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Posted 28 August 2011 - 09:52 AM

I ended up finding the answer that I was searching for in TM 9-1901 "Artillery Ammunition (1944) and indeed, there were compatibility issues. Here's an excerpt:

AMMUNITION FOR 155-mm HOWITZERS
244. GENERAL
a. The 155-mm howitzers are relatively short-barrelled weapons.
The HOWITZERS, 155-mm,M1917, M1918, and modifications, being
chambered alike, fire ammunition of the same designation. The
HOWITZER, 155-mm, M1, is chambered differently from these
howitzers, and the ammunition standard for use in these two types
of howitzers is, not interchangeable, (See subparagraph f, below, for
interchangeability of limited standard rounds.) The standard service
projectiles for the 155-mm Howitzers, M1917A1-17A2-18 have rotating
bands which are 0 .60 inch wide, whereas those for the 155-mm
Howitzer M1 have rotating bands which are 1.02 inches wide. Standard
projectiles for use in the 155-rnm Howitzer may also be identified by
a groove immediately to the rear of the rotating band . In
addition, the standard propelling charges for the 155-mm Howitzers
1917A1-1917A2-18 differ from those used i n the 155-mrn Howitzer
M1.


Sub-paragraph (f) contains a somewhat confusing table but appears to indicate you may fire the M102 H.E. projectile in the M1 as well as some gas and smoke shells as limited standards. It does not indicate any use of the M1 projectiles in the M1917-18s. This is a scanned .pdf file that is difficult to "copy and paste" and I needed to make multiple corrections to the above "copy and paste" I quoted so it was legible. Above the table in (f) it says "To be fired only in extreme emergency with the shell indicated".
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"Artillery adds dignity to what would otherwise be a vulgar brawl." - Frederic II of Prussia
"In 9 months and 3 days of combat on the Continent the 949th FA Bn had fired 51,000 rounds of ammunition, approximately 2,550 tons." - Unit History





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