May 24, 2012, 06:55 PM
Just bought a Marlin 783 Bolt / tube mag in .22 Magnum from a guy. I can get it to feed a round from the mag. As the bolt comes forward, it pushes the round forward. Then the tip goes up and into the very end of the chamber but the end of the case is just halfway into the bolt face. The round is at a sharp angle to the chamber and jams. This happens with each and every round. Can the extractor be to tight that the base of the cartridge wil not come up into the bolt? I took the Feedthroat out and it looks in great shape. The Cartridge Lifter and Spring also look OK. I dont see much of a feed ramp on the feedthroat but as I look at a schematic, it is identical. Any thoughts?? Thanks.
July 11, 2012, 12:14 PM
This really needs to go to a gunsmith for inspections/repairs.
The components which make up the feed assembly and the breech of your firing chamber aren't subject to casual adjustments the way they are fabricated and installed. There are no "user adjustable" components like screws or "user friendly adjustments" you can make.
The shape of the components themselves, and the way they are mounted, are crucial to the proper feeding action of a round of ammunition into the firing chamber. They all work together to align the bullet to allow the bolt to push the round forward, angle the bullet up into the firing chamber, and release the back end of the bullet from the magazine feed to allow the bullet to properly align with the firing chamber as the bolt continues to push it forward.
Assuming undamaged ammunition is used, any number of minor defects in the components which make up this portion of the rifle may cause feed problems. If you are not trained to understand how these components are designed and what they are supposed to look like in order to perform their part in this, then you likely won't even see any problems, unless it's obvious physical damage.
And, in addition to this, "adjustments" to these components are done by one of three methods, all of which are not forgiving at all with respect to mistakes:
1. Deformation (bending or flexing components to change their shape and therefore how they function).
2. Material removal (filing, cutting, grinding to change the shape and how they function).
3. Material addition (welding or brazing to change the shape and how they function).
Making a mistake using one of these techniques usually means replacing the part in question as a result. Or a more extensive, and therefore expensive, repair to the mistake.
Minor burrs and such can be carefully taken care of by most users with a basic understanding of the function of the component they are working and reasonable familiarity with using tools. However, when you don't know how the parts are supposed to work together to perform a function and the only means of adjustments are those three I listed above, then going to town on your own, even with the well-intentioned advice of others, will very likely not give you the results you are hoping for.
Take the gun to a gunsmith (or several for comparisons) for this particular problem and let him inspect it and tell you what it would take to fix it. The inspection generally won't cost you much, if at all depending on who you know; and if the repairs turn out to be more extensive than you anticipated in terms of labor and cost, it's well worth it just to know that.
Hopefully it will be something relatively minor and you'll soon have your rifle in good working order. From personal experience, this rifle is an outstanding rifle. I bought one when I turned 18, over 3 decades ago, and put untold thousands of rounds through it target shooting and small game/varmit hunting. Extremely accurate and reliable. Too bad it was stolen about two decades ago. I'm on the lookout for one, if I can find one in good condition at a reasonable price.
I wish you the best of luck with this repair!
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