Has anyone used any of these yet? <font color="red">Polymer-Cased Ammunition (PCA)Provides the shooter with Accurate, Consistent Performance. NATEC produces its PCA in the United States to meet ANSI/SAMMI Performance Specifications. Our State-of-the-Art manufacturing facility produces Superior Cartridge Cases froma polymer produced Exclusively for NATEC's PCA. </font> I have one box of 223rem that my cousin bought at Bass Pro (I believe). They shot fairly good as to what I expected. Looking at the casing about 3/8" at the bottom around the case head and web area is brass and the rest of the case is plastic. The tag on the box says 55gr Sierra Blitz and do not fire in fluted actions. Durring firing there eas no deformation of the case to my supprise. When he bought them the clerk at the store told him that they were reloadable, that the polymer had better memory than brass and would last longer. Any thoughts?