Blake
No it is not. starline makes both cases
Tuesday, August 27, 2019, 09:25

I had a long talk with one of their techs. I asked the difference between the Rowland, the Super and the Win mag cases. There is no difference between the Rowland and 45super case other than case length witch has no impact on strength or case volume do to over all cartridge length being equal. The Win mag is much more beefy case and can handle much higher pressure. When the detonics and 45 Super where developed the powders available limited there efficiency. The Rowland is nothing more than a modern loading of the old cartridges. I didn’t reinvent super just did what modern reloaders do. Like you and Linebaugh and the 38-40. The 45 Super will match the Rowland. As will the Detonics if the gun is set up right
I have done both.