Ah, the famous Marlin Model 60. I have one (I've had it since I was 14!) and passed it down to my daughter, who is deadly accurate with it!

Anyway, after all these decades with the Model 60, I offer this advice:

* CCI is the cleanest .22LR ammo for the Model 60. It likes CCI over all the dozens of other types of .22LR ammo.

* Do NOT shoot cheap, junk, bulk, ammo out of the Model 60. It will get real finicky and will start to jam.

* You have to keep the Model 60 clean at all times. You have to clean it after every 50-100 rounds. When you're done shooting for the day, it is best to break it down and really clean it good. Don't get me wrong... The Model 60 is a great little .22 but it can cop an attitude real quick if it is gunked up and dirty. I mean, it almost demands to be kept clean!

* Scrub the bore with a bore brush, or do like I do and take the Model 60 all apart. I run a tiny .22 bore snake through the bore, and I carefully remove the insides from the chamber (be very careful with the firing pin spring - it will go "ping" and fly across the room to parts unknown). Pull the plastic retainer bolt thing from the back of the assembly, and the whole upper and lower sections will come apart. Take the upper section and scrub the daylights out of it. Put it back together in reverse order.

Click here and you'll see details on the Model 60: http://www.castbullet.com/misc/m60.htm

Hope this helps!!