I have a Rem 700 chambered to 22 spitfire. The cartridge goes by various names including the 22/30, 5.7 Johnson, 5.7 MMJ [Melvin M Johnson's initials], and 22-30. It's listed in Cartridges of the world. I use it for walking around prairie dog towns. Fun gun to shoot, little noise, no recoil and easy to hit a prairie dog with up to a couple hundred yards. If I recall ballistics aren't all that different than the 22 fireball or the 5.7 x 28, but I could be wrong on that. I have a set of Lyman dies for it that I bought off the net somewhere. Necked down 30 carbine brass in one step losing 2-3 cases out of 500 to crushed necks. I do remember the smith wanted to have both the dies and reamer when chambering it to make sure the dimensions matched up (or something like that).
