Ordered some 22 cal bore slugs. Measured the bore and it is .224. Checked the barrel with the bullet test and it looked OK. Used the 55 gr Silver Bear HP. Later measured the bullet at .220. This ammo shoots OK with a keyhole every 10 rounds or so. The other ammo, Wolf 60 and 70 gr loads drop to the case in the bullet test. The 70 grain shoots tight groups with half the shots while the other half keyholes. The 60 gr FMJ and HP always keyhole. Havent measured the Wolf bullet diameter yet. The Silver Bear ammo fits very tight in the chamber and will pull a bullet out if a live round is ejected. The Wolf is a tight sliding fit but the Silver bear is hard to push into the chamber. Looks like the neck is too small. Most AKs have about 10 thousandths neck clearance, some have more. Im going to try to get the neck and throat reamed out for .224 bullets. Then try handloading with one of the 68 to 80 grain match bullets. The twist is 7.7 (measured) so they should work. I bought some Hornady 75 gr A-Max bullets and made up a dummy. Looks like it will work with the right neck and throat. Might be very accurate with match grade bullets. Barnes has a 70 gr all copper HP that might work for hunting.