I picked up this full box of 25 rounds XM257 at an estate sale today.
I have seen the W-W lot codes explained for centerfire metallic cartridges,
but this lot code is different.
Can anyone tell me about these rounds? I am interested in the date of the box,
scarcity, value, and history behind the XM257.
Markings should be clear but here they are
NO. 4B SPECIAL
Box Lot No. is D80ED92
SKU is GQ1307
Headstamp is W - W over 12 GAUGE
Here are the pics
I’m sure John or Dennis or someone will be along shortly to educate me.