This new 38-40 Winchester or known as (WCF). Uses a large pistol primers. 1.294-1.300 O.A.L. this cartridge is similar to 44-40, but necked down to accept .401″ dia. bullet. Starline 38-40 has a wall thickness of .0062″ which is stiffer and less fragile than other brands, this makes it easier to reload. Made in the USA.