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3" Field 75mm oh my


BOCN Contributor
I have a couple of projectiles/casings in my collection that I would like to sort out.

The first casing's head is shown below. Seems straightforward: 3" Field Gun. Right? Right.

The two projectiles in question, along with their fuze plugs are next.

I also have a 75mm casing that is completely unmarked.

Questions: What is the difference between the projectile for a 75mm and that for a 3" Field Gun? I think that the 3" has two grooves for crimping. Is that it though?

Might I (reasonably) correctly mate my grooved projectile with my 3" casing?

I assumed that the various fuze plug thingies were for shipping of the shells. If so, why so fancy? Why not one piece?



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I am attaching a scan of the base. Looks like the letters LN repeated twice, once followed by 16. There is also a circle with an N and another letter that I cannot make out.

What makes you say "Russian"?


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russian 7.6 or 3"

I know that American machinist have made some 3"russian shells for France, Russia and Great Britain
This shell is setting with Schneider Fuze
LN is perhaps for Lyon Artillery Park
Russian 3in

Sketche of 3in russian and 75mm french From American factory


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Documents extracts of newspapers American Machinist since the great war
re 3in

New york
The Industrial Press
The Machinery Publishing
London Co Ltd
By Douglas T Hamilton

i've two type of 3" Russian HE shell
Of your two projectiles, the one on the left is a 76.2mm Russian. There were bazillions of these made during WWI in the U.S.to ship to Europe, and you being in Connecticut are right in the middle of the manufacturing area where they were made. The one on the right is a standard U.S. 75mm MK I HE with the standard PD fuze. These were fired by the French 75 caliber guns. The National Guards fired them in the U.S. up till the 1930s. The fuze was so touchy, that they were ordered to stand behind concrete barricades to pull the firing lanyards, except in wartime. Neither projo goes with the case you pictured for the 3 inch field gun.