Speer 64gr GDSP and FED MK318? Cant find it!

[Jonah2014]

So I have some Speer .223 64gr GDSP that I would like to get more of and I cant find it anywhere...

I also have some Federal T556TNB1 white box stuff that I would also like but can't find that either.

Does anyone know where I can find more of these ammo types?
I have had no luck finding anything other then the 55 gr GDSP by SPEER. Any idea how the 55 gr SPEER performs compared to the 64gr?

Thanks

[Iraqgunz]

http://www.gandrtactical.com/cgi-bin/commerce.cgi?preadd=action&key=24448

http://sgammo.com/product/winchester/20-rds-556mm-bonded-winchester-ranger-64gr-jsp-ammo-ra556b