It would seem that I don't need the .22wmr cylinder after all. I purchased this pistol sight unseen through an internet auction and had yet to fire it until yesterday. Well, it appears that I already have a .22wmr. Yes,.22lr rounds do sound funny when fired in a magnum chamber, they also tend to bulge and split the casings.
Goes to show that items through the internet are not always "As Advertised". Now if anyone happens to have a .22lr cylinder for sale...