Why is your marlin model 60 jamming?
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.