Z375,
Any hone that will fit down the barrel will work, the rougher the grit the faster it will cut of course. I would start with a rougher grit and finish up with a finer one. the ones I used are made by Plews and are marked 72-309 1 1/8' medium grit. The 1 1/8 " is the maximum they will expand out to. I used hone in conjunction with these stones and you want to get a slurry going which will also help to smooth the tops of the lands up. Run the drill at a slower speed to start with at a right hand twist, you can back off on the pressure and speed up the drill after you get some of the roughness off. Most of these hones have a knurled nut that increases or decreases the pressure setting on the honing stones. Start heavy but finish up with light pressure. good luck. Bob