ID help needed


#1

Hello all,
Got this from a friend and have no idea what it is.
HS: IVI (12 o’clock), 71 or I ( 6 o’clock)
OAL: 2.474
Cl: 2.247
Rim:.31


Belt: .31
Case Base: .295, case tapers to .274 and then necks to .245
Bullet: .231, there is green plastic over bullet
Case and bullet are slightly magnetic. Primer recesses .04. Primer pocket is .168. Came in a black plastic belt link.


#2

Looks like a 5.6x57B XM645 flechette cartridge. Can you snap a pic of the primer and belt link?


#3

Rookie; Your cartridge is a 5.77mm (one box label says 5.8mm) XM645 Flechette round made by Industries Valcartier, Inc. in Canada in 1971. It has a 10-grain flechette with a green Teflon coated sabot. Some of these have a D A headstamp for Dominion Arsenal, which was acquired by Valcartier. HWS Vol. III, page 326.


#4

Thank you for the ID. This forum is great.

Rookie


#5

What gun was this fired from.


#6

Here is a sectioned round.

Paul


#7

One of many experimental cartridges for experimental firearms from the SPIW (Special Purpose Individual Weapon) R&D program, for a quick review there is a series of articles from Small Arms Review:

http://www.smallarmsreview.com/display.article.cfm?idarticles=2768
http://www.smallarmsreview.com/display.article.cfm?idarticles=2892
http://www.smallarmsreview.com/display.article.cfm?idarticles=2927

The 5.6x57mm XM645 cartridge is pictured in the image gallery accompanying the second article.

These 3 articles were written by R. Blake Stevens who co-authored the book The SPIW The Deadliest Weapon That Never Was which provides an in-depth history of the SPIW program.


#8

About 35 years ago I was given 6 new unfired SPIW cases that came from a brass foundry where several hundred pounds or so of these cases had arrived for melting down.


#9

Thanks to all for the great info.