Winchester model 100 jamming

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Over this long weekends my brother brought some of his rifles from his collection, one of them was Winchester model-100 in 308, so we hit the range where I tried to shoot it, the first 4 shots went without a problem so I was able to sight it scope, but after that it would only fire one shot and do not eject or it will eject spent case but lockup with live round, we even had to use wood block to hammer it to get it open. Other then jamming its very nice piece with good furniture.
So any ideas why it jams? We did take it apart and cleaned it before shooting it. Also the ejected brass was all badly chomped, its bad for reloading.
 
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There was a recall decades ago on the 100. The firing pin was prone to break, jam and cause a slam fire. The other problem involve slop in the front of the trigger guard with the dovetail getting loose. If the trigger guard screw in the rear gets even the least bit loose the gun will jam.

Field strip the bolt, if the firing pin is square, you're good to go on that.

Make sure the trigger guard screw stays tight.
 
This is 1962 model maybe even earlier, guess recall didn't covered it, my brother purchased it from gunbroker.com, I will relay this info to him, hope he can get it working. Thanx!
 
Were you using factory ammo or reloads? If reloads, case sizing could be the problem.
 
hoghunting +19

You didn't mention the type of ammunition you were using. Reloads? Surplus? Factory? Auto loaders need SB (small base) dies for reloading. It sounds like to me that some of the cartridges are binding in the chamber. I might suggest doing a chamber casting and compare that to ammunition you're trying to feed it. Mike' the cases near the base and compare it to the chamber casting. You might be surprised!
 
We had box of Winchester and Remington factory ammo, and Winchester ammo was jamming more then Remington. I'm thinking to make reloads from used brass, from what I can tell Remington brass is much thicker then Winchester, and Remington had roll crimp on their ammo, but Winchester has 4 pressure marks left from the crimp left on the neck.
 
the first 4 shots went without a problem so I was able to sight it scope, but after that it would only fire one shot and do not eject or it will eject spent case but lockup with live round, we even had to use wood block to hammer it to get it open. Other then jamming its very nice piece with good furniture.
Click to expand...

Maybe a pitted chamber.

I have seen lots of reloads jam semi autos. Brass sized in standard sizing dies may be a crunch fit in the chamber. After the round is fired the interference fit between the case and chamber is such that the case cannot be extracted. At least without a drill rod and wood block.

If it is reloads, someone might need a small based die.
 
I called my brother today, he told me that he tried Brown Bear 308 145 gr FMJ in steel cases and there were no jams, he only fired 8 rounds. Right now I'm trying to convince him to get chamber polished with steel wool then with J&B.
For reloading I got RCBS FL dies and LEE FL in 308, somehow LEE squeezes neck tighter then RCBS, I noticed when I tried neck turn, the pilot wouldn't go in, so I had to resize brass one more time with RCBS.

By the way does any one know what rate of twist model 100 used?
 
Right now I'm trying to convince him to get chamber polished with steel wool then with J&B.
Click to expand...
+1

Hard carbon fouling or rust in the chamber is the most common cause of what you describe with the Model 100.

The problem is, you have to clean them from the muzzle, so the chamber never ever gets a proper scrubbing with the undersize .30 cal patch or brush.

I'd suggest a .40 caliber bronze bore brush with Super Fine (0000 grade) steel wool wound on it. Then run a cleaning rod down the barrel and screw on the brush from inside the ejection port.

Then spin it up in a cordless drill with solvent and polish the crap out of the chamber.

I'd also suggest you tell him to lay off the steel case ammo.
Winchester never intended for the Model 100 extractor to have to deal with anything except good old American made brass cases.

And if you break one, you will have one heck of a time finding a new one.

rc
 
Thank you everyone! I just convinced him to drop by so we can work on that chamber.

To spin cleaning rod with a drill, would require destroying cleaning rod, the handle must be cut, maybe its possible to do this by hand, will see. I hate destroying my Tipton carbon fiber or SS Kleen-Bore rod.
 
You could go to Wallyworld and buy a cheap jointed cleaning rod kit just for "special" jobs like that. You will need it in the future to clean the chamber on the Model 100 more often anyway.

Get a Hoppies jointed aluminum rod and cut the handle off.

I have two jointed SS Kleenbore rods and can put sections together to whatever length I need.

rc
 
Beating it open with something is going to break the action bar. I was warned of this. One of the biggest reasons for jamming is the gas recoil operation of the system. The 100 will have the same problems as the AR with carbon build up. Take it down and clean the system and it should take care of your problem.
Except.......you original comments describe the aforementioned traits.The firing of the steel ammo puzzles me.Maybe it is the combination of dirty gas system and the chamber. Anyway clean the gas sytem.

Tacticalweapons006.gif
 
I called my brother today, he told me that he tried Brown Bear 308 145 gr FMJ in steel cases and there were no jams, he only fired 8 rounds
Click to expand...
.

It is your oversized reloads.

Clean the chamber, always good. I look first and if it has a mirror finish, I would not use aggressive polishing materials. Use a copper chamber brush.
 
There were no reloads in this chamber yet, I'm only planning to reload for it. The brown bear ammo also didn't work as I described previously, there was jam on 4th round.
 
Thanks, well we got together I cleaned and polished chamber oh his model 100, then we shot 4 clips 16 rounds total without jams, next day he called me and complain it jams again. I asked him if he cleaned anything after our shooting, he told me he didn't. I guess he needs to get habit of cleaning guns after shooting them.
 
As noted by others Winchester had a re-call on their M-100 a while back.
I had one I got from my brother,who sent it somewhere and had the
"re-call" problem corrected. It never gave me any problems.

Just for the record, mine didn`t group for squat. Plus, it weighted a ton.
Felt like it anyway. Gave it back to him.

Now I know why he gave it to me.................... :)
 
100

Back about 35 years ago, I knew a guy at church who was a Biologist. He had worked in Texas for a time and shot many deer with his 100. But he had the same jamming problem and traded it off for a Browning auto loader. No further problems.

For parts and service: Jack First 605 343 8481

TR
 
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