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Sherman 75mm vs 76mm, did they share bore and groove diameters?


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time2reload #1 Posted Mar 13 2019 - 15:34

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I had always assumed the 75mm and 76mm guns used in the Sherman were the same bore and groove diameters and they just lengthened the case for the 76mm to increase velocity and the nominal diameter change was in name only to reduce soldier/supply confusions.  I have found multiple source that say the 76x540R used in the Sherman 76mm M1A1 gun and the 3-inch gun (76.2x585R) use in the M10 used the same projectiles.

 

What I can't find is was the 75mm (75x350R) used in the M3 gun truly a smaller caliber gun?  The M61 projectile used in the 75mm gun sure looks very similar to the M62A1 projectile used in the 76mm and 3-inch guns.  I can't find anything concrete like a drawings.  It seems that the 75mm gun was truly 75mm bore diameter an the 76mm and 3-inch guns are 76.2mm bore diameter but I have not seen that concretely proven.

 

Are there any bore and groove dimension drawings for these guns on the internet?  Any info to satiate the nagging curiosity would be appreciated.  -Thanks



Waarheid #2 Posted Mar 13 2019 - 17:00

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Page 6

1045347.pdf

The shell diameters are different. 

 

 


Edited by Waarheid, Mar 13 2019 - 17:12.


time2reload #3 Posted Mar 13 2019 - 17:39

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View PostWaarheid, on Mar 13 2019 - 11:00, said:

 

Page 6

1045347.pdf

The shell diameters are different. 

 

 

Thank you Waarheid.  That confirms they where different.  Thanks!  I should have searched DTIC myself but I had mistakenly assumed that archive did not look that far back.






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