The .225 Winchester is very close to the .219 Improved Zipper.
Sometime before 1900 Charles Newton begot the 22 Hi-Power Savage. In 1937, Winchester begot the 219 Zipper. In 1938, P.O. Ackley begot the 219 Zipper Improved. In 1963 Winchester begot the 225 Winchester.
The differences between the 22 Hi-Power, 219 Zipper, 219 Zipper Improved and the 225 Winchester are slight. They are all based on the same cartridge; the 30-30 Winchester. Yes, some are shorter than the others. The shape of the cases differ and the rims differ somewhat but overall they all are based on the 30-30 case.
I remember when the .225 first came out. One of the reasons it was so accurate was that Winchester had all new machinery to manufacture the ammo and was it ever a shooter.
