I have a 17 Remington in a Savage 10 action. I used all .223 stuff, bolt head, magazine and follower. The sholder is set back a little further on a 17 Remington so the case has a longer neck, sizing a .223 brass to 17 Remington results in a case with a very short neck for the 17. A 204 sized down is much closer. Mine feeds well from the magazine, I did have to bend the ears of the mag a little, and put a little piece of sheet metal in the front of the magazine to lift the bullet tip, but if you are not using a Savage and the barrel you use has a recessed type breach then it will probably work without any mods at all. Now some info for you. I used a Green Mountian barrel with a 1 in 9 twist, it shoots the 30gr Berger BTHP's very well, however when I get the 20 and 22 gr bullets up to 4,400fps they just turn to dust about 30 yards out, so figure out what weight bullets you want to shoot and then get a barrel for that weight, I would go with a 1 in 12 twist if I were doing it again. Good luck, the 17 Rem is a really fun rifle, you can watch the hits without any trouble at all. Larry