Yes, you are confused. Winchester never introduced a WSM in 25 caliber as you originally suggested. It did make a 25 super short magnum, and it was a bad idea.
Only metric caliber cartridges that really caught on in North America are the 7mm's, which is why you will see 270 WSM, 300WSM and .325WSM ammo on the shelf at Canadian Tire, but you will never see 9.3x62.
So the 6.5x55 never caught on in North America? Give your head a shake..




















































