Answer Not much info in the question, but try this. IF the Model 60 is a .22 long rifle, and a semi-auto, you very well might run into failures to feed or eject of you
…use sub-sonic, or standard velocity, ammunition. Most semi-autos are set up to work with the high velocity, or supersonic, .22 ammunition. Standard velocity ammo is often manufactured as high quality target rounds. The reason for this is that, since the bullet does not exceed the speed of sound, it won't make a sonic boom..or crack, in this case. The theory is that breaking the sound barrier makes a .22 bullet a little less accurate. For small game hunting and most other uses, the high velocity round is plenty accurate, and tends to put small game down a lot more reliably and humanely, especially if hollow point bullets are used. Since the subsonic rounds are a little slower because they're a little less powerful, they may not alway generate enough pressure to activate a common blowback action semi-auto rifle. If you try high velocity ammo and it works fine, you have the answer to your question. *** Good info there, also try this: Clean your feed ramp. Subsonic ammunition is usually very soft, and can foul the entire action. Ammunition such as Aguila and others that offer very low velocity subsonics don't provide enough force to properly cycle the action. If you're getting a lot of cases that 'stovepipe' where the spent case is not fully ejected from the action, you're probably using a subsonic that's too slow. Try Remington or CCI subsonics. They both function nicely in all my .22 semiautos, including my venerable old Mod 60. ______________________________ I'll also add that in .22lr bulk packs, avoid Remington Golden like the Swine Flu. They are inconsistant at best...maddening with squibs & short-powder on a regular basis. Sub-sonics tend to be spotty in performance with semi-auto's that use standard blowback actions. (MORE) 
