Put a couple up in the Classifieds,
FYI
Hey there aught I was just wondering if I could get the 300 rounds of 223 you promised me on our trade my 220 swift and your AR.
You claimed that I would get them but it's been several years so I guess that I won't be getting them.
Also thanks for not returning my requests to repurchase the same 220 swift that you still owe me the 223 ammo.
All of this is just another reason I don't like trading with guys like you.
And by the way I got the 220 Swift anyway so karma is a B