40mm Bofors?

[Derek]

Just got this projectile, I believe it is a 40mm Bofors AP?? But I would like to know the period as there is no date stamp and the country of origin.
The driving band is stamped: NR MK 4 MOD LOT 21. It is 159mm in length and 40mm dia.

Can anyone help?

Thanks.....

 

[SHAKY]

Nice Bofors there. It looks just like my 40mm M81A I have dated 1945. Except yours is much nicer. I think my M81A is U.S. and your Mk 4 is British but dont know the manufacturer.

 

[tigbrand]

Hi Derek,I have a ww2 date MkV canadian Bofors case which has the crimp cannelure in a different place and doesnt fit a normal projectile,could you measure from the center of the groove to the bottom of the band for me please?http://www.bocn.co.uk/vbforum/threads/82648-WW2-Canadian-Mk-V-40mm-Bofors-case?highlight=bofors+MKV

 

[Derek]

Hi Tigbrand, If I have understood you correctly, I make it 54mm.
Now I would like to know what type of Bofors this is for and a possible date, is a Naval or Army round?

 

[TonyE]

"NR MK 4 MOD LOT 21" is U.S. Navy nomenclature, not British. probably 40mm L/60 but I don't know for sure.

Regards
TonyE

 

[tigbrand]

Hi Derek,thanks for the reply. I have measured my case and from the top of the case to the middle of the crimp is 14.5mm,so you measured somewhere different! I think your shell type is correct for the case though. As Tony E says the markings are not British.US and Canadian projectiles are marked on the band. Does nobody else have an idea of the use of this round,case or projectile??? Cheers Tig.