Like Lucky said, they are the Remington Hulls.* Technically the STS are the "Green" Hulls and Nitro 27 Hulls are "Gold".
Except for color they load and perform the same.* I like the Gold because the look good on the shell belt. :
For those who don't know the internal differences between the Remington and current Winchester AA hulls here it is:
A pair worn Remington hulls after a few reloads (smokeless only).* STS on left, Nitro 27 on right (note they are the same construction)
The new Winchester AA hulls in both red and black.* While they are not the true Reifenhauser style as I said in an earlier post, they are now a 2 piece design.
I'm not bad mouthing the Winchester design, they just aren't the "one-piece" compression formed hulls that the Win AA made it's reputation on.* The new design which is protected by patent is not the sometimes problematic Reifenhauser design it is a two stage compression formed and fused hull.* Internally the new Winchester hulls are more or less identical to the old one piece hulls.* The disadvantage for us as BP shooters is that there is apparently a change to the polymer alloy that allows the two pieces to fuse together under heat and pressure.* That same trait makes them burn and melt more easily under the increased heat from BP.
With the ubiquity of AA hulls and the fact you can pick them up everywhere, you could use them once and throw them away.* Even so, I still think the Remington hulls shuck better even after the first reload with BP.* Maybe someone will do some controlled friction tests between the two, but it needs to be done as soon as the gun is fired and allowing them to slide out at some controlled angle.
Regards,
Mako