The bullet in the .22 WMR isn’t a larger diameter but the case is longer. In .22 ammo, the makers imagination is the limit of development and use. Hyper velocity to down right slow and from a BB’s to heavy ( for a .22 ) and load to quiet ( for a .22 or air rifle ) can be found. They have been made in so many countries around the world that it’s shocking to see what has been made.I would say the 22 mag is in a family of it's own since the bullet and case is larger.
The LR will fit in the WMR chamber but it’s not recommended. The WMR WILL FIT IN THE LR chamber but you have to hit it with a hammer just a bit. Just kidding. Do not try this at home! Thank you for the 1000ths of an inch correction.yo, Stamp. The .22 long rifle bullet is .223 case is .226 and the 22 mag bullet is .224 case is .242