Welll, it's a bit more complicated than that, AMink

..... NOT to talk down to ANYONE, but the cartridge dimensions prevent any interchange... . The bullet diameter, design, and seating is not the problem, here. The problem is the cartridge cases themselves are of such different dimensions, firing a . 22LR round in a . 22WMR chamber will cause the case to rupture, spewing hot gas and probably pieces of metal back out the receiver, and perhaps even not allowing the bullet enough pressure to escape the bore... . It'd doubtful you could even get the . 22LR to fire, as the rim diameter of the cartridge (. 272) is only slightly larger than the case diameter (. 242) of the Magnum, allowing it to stay in position, but it would randomly fall in various places in the chamber. Case diameter of the . 22LR is . 226. The rim is also thinner (. 043 vs . 050), so headspacing would be extremely loose, and the firing pin wouldn't be able to strike it properly in most instances. It would be in comparison to shooting a . 22Hornet in a . 223Rem chamber, with less overall pressures, of course... . Chamber damage would be possible, as well as damage to the firing pin, bolt face, breech, and possibly the shooter. Pieces of the cartridge could even go down the bore. It would have to be cleaned thoroughly afterwards, and examined for damage properly by a gunsmith, IMO.....
Quick fun!! Name the cartridges, Left to right!!!

(Uhhh, up to down... . ? Stupid computers... . It doesn't show as being sideways on my PC..... :grrr
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