[Hazcat]

So Winchester made the 22 automatic chambers and cartriges slightly larger in dia. so they wouldn't fit in the regular 22 cal. and used smokeless powder

So if you have a .22 from before 1903 it won't chamber modern .22?

[Beagle8U]

"So if you have a .22 from before 1903 it won't chamber modern .22?"

I think the modern 22 rimfire is the same size as the older 22 rimfire that used black powder.

Only the Winchester 22 automatic is a different size. They are no longer made.

OWS ( old west scrounger) did special order a run of 22 automatic ammo last year and they have them available in boxes of 50 for something under $10. ( I forgot the price $7.50?)

[Beagle8U]

I should note that there was also a 22 special that was made years ago that was longer than the 22 LR rimfire but is shorter than the modern 22 mag.

The 22 special, 22 winchester automatic, and the newer 22 mag. are stamped as such.

All others will be stamped 22 cal. S-L-LR. ( or just one of those).