Model 74 22 long rifle jammed and cannot eject the ammo or casing. Rifle just given to me this way. How can I get info to disassemble?

this is copied from a site, the web address is pasted below.

The serial number depending on the model of rifle, will be located either on the upper or lower stock tang, or side of the receiver.
http://www.gunvaluesboard.com/marlin-serial-numbers-dates-of-manufacture-1664.html

also if you find serial # you may find more info here.
http://oldguns.net/sn_php/marlinlookup.php

From 1962 thru 1968 Marlins rimfire rifles (other than the 39 series lever actions) used a two letter date code that was stamped on the barrel. This date code is different than the one already listed, as Marlin rimfire rifles (other than the model 39 series) did not have a serial numbers until required to by Law after 1968. The first letter of the date code represented the month of manufacture while the second letter indicated the year. This date code was usually stamped on the left side of the barrel just in front of the receiver.

It's a Model of 1873 'Trapdoor'. LOW POWERED ammo ONLY. Do NOT shoot ammo designed for Marlin or Ruger.

this question is a bit silly since eventually you will need to resight your weapon for the new ammo anyway. So spend the time and the ammo costs to go to the range and do it right, right from the get go.

this way you won't need to recalculate drop rate and use kentucky windage for every shot at differing ranges.

Recommend from USMC sniper/rifle expert.

Check which part is hotter than others, see if applying of a lubricant help in solving the jamming problem of your rifle.

Often with semi-automatic rim fire rifles, the most common cause of jams/failures to feed are related to improper cleaning. Most of these low-powered rifles utilize a blowback action to fire, and thus require a clean breech and chamber to provide proper obturation of the cartridge. Give your rifle a thorough cleaning, including a detail strip and clean. If you are experiencing other types of stoppages such as failures to extract or failure to feed, you may be experiencing a mechanical issue such as a worn extractor claw, or a weak magazine follower spring.

It takes about 250 rounds to break in a gun. Try some hotter ammo and see if the problem disappears, if so, call Marlin and ask them for their solution if you want to keep using Federal, you might want to try some Remington standard velocity target, it is very accurate in most guns.
I would shoot it for at least 500 rounds and clean it from powder debris in chamber and receiver bolt and trigger group and try it again, however don't hesitate to get a hold of Marlin, they are nice folks.

Check out this site here. Winchester 61 History. You can find which model you have. Hope this helps Fix Ya up.

Blown primers and hard ejection are clear indications of excessive pressure. If these are handloads you need to back off on the charge and possibly make other changes in your load. Check a good loading manual for reference.
If they are factory loads you perhaps have a headspace problem or the oal with that particular bullet is too long for your particular rifle, jamming the bullet into the rifling, and not allowing it any "jump space" or lead.
1. dont fire anymore of that lot of ammo, and contact federal.
2. check with a qualified gunsmith, have headspace, and bore diameter checked.
3. if your knowledgable in smoking the tip of a bullet, check for lead, or have this done by a qualified gunsmith.

Wolf is a cheap ammo you dont pay much but you dont get quality ammo either. Make sure your gun is clean and the extractor spring isnt worn thats about all you can do in this situation.