Not only is a 22 WMR case longer than a 22 LR it is bigger in diameter. Yes, you could end up with a mess on your hands as well as hot brass and gasses in your face if and when the 22 LR case splits from being fired in a chamber that is too big for it. Whoever rechambered the gun should have stamped the barrel accordingly. My guess is the whole thing was probably a hack job.