[quote=“SDC”][quote=“craigt”]I have another Canadian flechette cartridge very similar to the XM645.
However it only has a 52mm case length. It has a silver piston primer with a IVI 69 h/s and the projectile has a red rubber ring around it when removed from the case.
What designation does this cartridge have? What other information do other people have on this cartridge? I had a quick look through Ezell/Stevens book on the SPIW but couldnt see anything.
Any help would be very much appreciated.[/quote]
Craig, I’ve got the same book on the SPIW, and you may have an XM110 SPIW round; this would have been one of the “intermediate” steps between the original idea and the eventual XM645. Because so many people had their fingers in this particular pie, each of them had their own ideas about what they wanted out of the round, and H&R, Springfield, and AAI all developed their own loads for this project. Does your round have several deep “dimples” down near the case head/web, or is it smooth all the way along?[/quote]
The XM 645 and XM110 have different cases :
XM 110 Head : 7.52 CL: 53.26 (5.6 * 53)
XM 645 Head : 7.87 CL: 56.97 (5.6 * 57)
XM 645 shortened for trials : Head 7.87 CL : 52 (5.6 * 52)
What is the head of yours excatly ?