A Marlin Model 60 might be jamming often do to a problem with the parts inside. An older gun might need to be thoroughly cleaned. There could be too much friction or a part is worn out in the trigger mechanism or in the bullet chamber.
lead ammo
Auto shotguns most often jam because they need a thorough cleaning. If the gun is clean, it may need adjustment or repair. You are best off toaking the gun to a gunsmith for assessment.
The model 60 had this problem alot usually the gun needs to be cleaned, there's alot of talk that 36 grain rounds cause jams too. 40 grain is a little better but if you dont clean regularly it will still jam and not eject correctly.
you must use cci hypervelosity long rifle ammo. this will result in jam free ops. That would be a no on the Hyper ammo. Marlin specifically states in the manual NOT to use Hyper Velocity ammo in their semi-auto rifles. It's fine for the bolt action and lever action rimfires, but not in the semi-auto. The semi-auto Marlin rifles were designed to shoot High Velocity only and using Hyper can damage them. There are a lot of reasons a Marlin or any other rimfire rifle might "jam", but we'll need a lot more information on the particular problem. Jamming could be anything from a failure to feed, extract, eject, stove piping or other problem. We just need more information. If you really need help on your Marlin 60, surf over to Rimfire Central's Marlin forums. A lot of great advice and they/we should be able to keep your 60 running smooth. There's also a lot of information on upgrades available for your 60 if you decide to make some changes. For the record, my personal Model 60 doesn't jam and it has 10,000+ rounds through it since 2005. They're great little rifles if they're running as they should.
a month
yes the band pearl jam
The lifter which lifts the shell from the magazine tube to the chamber and aligns it for the bolt could be broke or worn.
No. Jelly has a TON of sugar in it, jam has more fruit than jelly. You can often find more fruit chunks in jam. Jelly does not have fruit chunks in it.
Every 15 minutes
No clue try wickipeadia
Since I am unable to access records for testing, I am unable to assist you with this question. I recommend speaking with Amber's teacher or professor to see how often she is scheduled for Jam Testing.