JonC, Welcome to the forum! I hope you will find some items of interest to you. The basic calibers for the M219 were .22 Hornet, .25-20 W.C.F., .32-20 W.C.F., and 30-30 W.C.F. The Hornet and .30-30 are common. The .25-20 is hard to find, and the .32-20 is VERY RARE! There are rumors of other calibers, but all I have seen personally have been re chambers. Example, .22 Hornet to .219 Zipper, or .218 Bee, .30-30 to .30-40 Krag, etc. Beware and check carefully before buying anything except those former four I mention. On the 220 shotgun, the same action, you will find 12, 16, 20, 28, and .410 gauges, with the 28 being the hardest to find. There were a few .22 SHOT gauges made during WWII, some 9 MM rimfire chambered barrels, re-chambered to .357. These two show up for sale once in a while. Again, thanks for joining and good luck on your search for a .30-30. Gun Broker is a good place to find one. Best wishes, Garnett