Max, I called and left you a message earlier today.Yes the hulls are simular but much different.The RST hulls are shorter a much better quality.They will load easier and more times.The new Winchester 16ga stuff is made in France and the same length as the new Herters but the Winchesters are better to load.Loading 16ga.ammo is a real pain these days with so many different lengths out there to deal with.The stack height is different and when I have run them accross my Chrony the FPS readings are different too.Ready to pull your hair out yet! You get the hint that maybe somebody does not want us to load these.Charlie.