Author Topic: Remington 750 ftf problems (Read 2326 times)

xeno · « **on:** October 16, 2011, 01:49:34 PM »

I've got a new Remington 750 .308.

I put 100 rounds through it, with 6 failures to feed.

It's always the same thing with a successful ejection, followed by a miss- feed of a live cartridge with the nose of the bullet tipped up into the chamber, and the bolt pressing against the rear of the cartridge.

The rifle has been cleaned, the magazine looks okay, and I tried a test I found on the Internet about using some tape to make sure the bolt was traveling all the way to the rear during the firing cycle -- it is.

Any ideas about what's going on and how to fix it?

thanks.

gunnut69 · « **Reply #1 on:** October 16, 2011, 10:03:41 PM »

Was the gun thoroughly cleaned after purchase paying special attention to the gas system? The port should also be cleaned.. I've not worked a 750 yet so details are not in the brain..such as it is. Check the magazine for burrs on the feed lips and be certain there is sufficient lubrication of the moving parts..cam slots, bolt carrier ways..etc. Check the jammed round for any marks. Many times the damage done to the round that failed to feed will give us an idea where to look for the problem..

xeno · « **Reply #2 on:** October 17, 2011, 01:48:04 PM »

Quote from: gunnut69 on October 16, 2011, 10:03:41 PM

Was the gun thoroughly cleaned after purchase paying special attention to the gas system? The port should also be cleaned.. I've not worked a 750 yet so details are not in the brain..such as it is. Check the magazine for burrs on the feed lips and be certain there is sufficient lubrication of the moving parts..cam slots, bolt carrier ways..etc. Check the jammed round for any marks. Many times the damage done to the round that failed to feed will give us an idea where to look for the problem..

The jammed cartridges were not particularly marked up.
I did most of your suggestions, with the exception of digging into the gas system. I don't think Remington thinks users should do that much disassembly, and I didn't want to give them an excuse to vacate the 2 year warranty the gun is under.
I called their customer support and they had me ship it to a gunsmithing place in Minnesota, at their expense.

We'll see how well this repair thing works out. I've come across some stories that do not inspire confidence.
Personally, I suspect it's the magazine and/or the magazine latch. The 1st jam was the 3rd shot out of a rifle, so unless they really gunked up the gas system it should have nothing to do with the gas system itself or the ammunition. It kept jamming intermittently through the next 97 rounds.

It's just amazing to me how many jam stories there are on Remington semi-autos. It's bizarre they would let this sort of thing go on and on without either fixing their problems or dropping the line.

chefjeff · « **Reply #3 on:** October 17, 2011, 02:29:54 PM »

Red-headed step-child of 742.No offense to same.....

drdougrx · « **Reply #4 on:** October 17, 2011, 04:59:56 PM »

I had one in 35whalen. Never a jam....it was just antisocial. Seems the bullets didn't like each other as they refused to cuddle at 100 yards.

xeno · « **Reply #5 on:** October 17, 2011, 06:36:53 PM »

Mines not too bad on groups.

Nice hog, where did you nail him?

drdougrx · « **Reply #6 on:** October 18, 2011, 04:55:53 AM »

New York.....pen raised....went on preserve hunt for an afternoon cause it was close to a business meeting that I had to be at....I figured what the heck, it's cheap enough, I'm here and the meat was good. Live weight 318lbs prior to field dressing.

oneoldsap · « **Reply #7 on:** October 18, 2011, 09:39:57 AM »

If it's failing to feed from the same side each time , just open the lip on that side a smidgeon so the shell rides a tad higher in the magazine . I get most of them to work doing this procedure ! I guess Remington keeps building their semi auto because people keep buying them . I'll take a pump any day , I know it will fire every time .

gunnut69 · « **Reply #8 on:** October 19, 2011, 11:24:25 AM »

The 740-742's wear out.. The cam slot in the bolt head wears to the point that the bolt will over rotate and notch the inside of the receiver at the bottom of the bolt carrier ways. If you doubt me check the inside of a few 742's at a gun show. Just insert a digit into the ejection port with the bolt locked to the rear..(be certain it stays back) and feel the groove the bolt carrier rides in. If you've a flash lite you should be able to see the afformentioned grooves. I believe its a lubrication and poor heat treat issue but Remington side stepped the problem halting production of the model. For a time if you had issues with one (740-742) staying open after a shot big green would issue a voucher good toward the purchase of a remington product upon its return,.,. Locally we did have one that was soooooo worn it allowed the bolt to fully close without turning the bolt head fully into lock. Naturally when fired the rifle exploded. The one piece receiver saved the shooter from damage (except perhaps to his laundry) but the rifle was a total loss..He sent it to Remington and got the voucher.. After sufficient wear the bolt lock is all that restrains the head and total failure is at hand. The sad part is in some acses the round cound can be truly low. Theres a 243 in the shop that is nearly new and locks the bolt back every magazine.. Notches are there though small. Amazingly the same basic action works very well as a pump.. and seldom if ever wears out..

xeno · « **Reply #9 on:** October 19, 2011, 03:15:01 PM »

It may be that Remington either doesn't know how to design and manufacture high power semi-auto rifles, or doesn't care what it turns out and sells.

BBF · « **Reply #10 on:** October 20, 2011, 07:43:16 AM »

Does it do the same with RN bullets?

gunnut69 · « **Reply #11 on:** October 21, 2011, 08:06:39 AM »

If the jammer cartridge is not marked up it almost seems as if something else is stopping the bolt or the bolts energy is so low that it is barely stripping the round from the magazine. If the bolt handle is firmly bumped does the round go ahead and chamber? If it does with just a little marking (all autoloaders mark up the brass some) then it would sem the bolt may not have sufficient energy to overcome the resistance it is meeting from the magazine and the round entering the chamber. This is usually, in the case of autoloaders the result of the gas system not receiving enough gas and short cycling. If there is sufficient lunrication I'd clean the gas tap port.. This is reachable thru the gas block by removing 2 cone tipped set screws.. The hole under them contains a steel ball bearing that is forced into the access port to seal it off. Don;t lose the ball!! I clean with pipe cleaners and acetone.. Keep the acetone off any finished wood or plastic and never use an steel or metal cleaning implements..

xeno · « **Reply #12 on:** October 21, 2011, 03:22:16 PM »

The live cartridge being chambered is what stops the bolt - it's point is stuck against the upper part of the chamber.
I'll try to upload a pic that shows what I've been seeing.

gunnut69 · « **Reply #13 on:** October 21, 2011, 10:38:19 PM »

The picture shows the casehead completely free of the magazine.. Something other than the cartridge being fed is stopping the bolts forward motion. Could you have a bent action bar(on the front end of the bolt carrier), damaged or weak recoil spring (around the action tube in front of the action) or could the bolt lock be damaged??? Do the action bar slots have lube? Grease is best here.. Are the cam slots in the tail of the bolt head greased also? For these a high pressure lube would be best. These slots are the cause of such problems in the 740-742 at times.. They wear a dent or wide spot at the impact points, where the cam pins hit the hardest. This can cause stalling of the bolt.. Is the bolt dragging on the magazine, either beneath the bolt or rubbing on the feed lips..

xeno · « **Reply #14 on:** October 22, 2011, 08:33:57 AM »

>

Quote from: gunnut69 on October 21, 2011, 10:38:19 PM

The picture shows the casehead completely free of the magazine.. Something other than the cartridge being fed is stopping the bolts forward motion.

I think it's the bullet point being jammed up into the upper receiver/chamber area that stops the cycle.
I've been thinking it's probably a magazine/magazine latch problem, but the gunsmith has it now and maybe he'll figure something out. I got the rifle new, and other than cleaning the bore and the receiver area, I did nothing to it.

>Could you have a bent action bar(on the front end of the bolt carrier), damaged or weak recoil spring

If the factory spring is a little weak, it could be allowing the nose of the new cartridge to be come too high, and then jamming it against the upper receiver/chamber area? Maybe.

>(around the action tube in front of the action) or could the bolt lock be damaged??? Do the action bar slots have lube? Grease is best here.. Are the cam slots in the tail of the bolt head greased also? For these a high pressure lube would be best. These slots are the cause of such problems in the 740-742 at times.. They wear a dent or wide spot at the impact points, where the cam pins hit the hardest. This can cause stalling of the bolt.. Is the bolt dragging on the magazine, either beneath the bolt or rubbing on the feed lips..

I took the front stock off just to look at it before firing, and it looked all lubed up and correct. Here's a pic of what it looked like, I doubt it shows anything out of whack.

xeno · « **Reply #15 on:** October 22, 2011, 08:41:38 AM »

Quote from: oneoldsap on October 18, 2011, 09:39:57 AM

If it's failing to feed from the same side each time , just open the lip on that side a smidgeon so the shell rides a tad higher in the magazine . I get most of them to work doing this procedure ! I guess Remington keeps building their semi auto because people keep buying them . I'll take a pump any day , I know it will fire every time .

Unfortunately, I didn't note what side of the mag each jam was occurring from.

gunnut69 · « **Reply #16 on:** October 22, 2011, 07:01:26 PM »

I your photoes the action bar appears rubbed. If this is the case and there's little lube the friction could reduce the energy of the action. Also on the left side view the gas block on the end of the action bars appears smeared. Perhaps hitting the inside of the forearm? The spring you indicate is the foreend spring and serves to keep it aligned and from rattling. I doubt whether theres any difference with where the round comes from as these mags are center feed. The shells are held in lips centered in the mag.. It is a good idea to deburr the lips..

demented · « **Reply #17 on:** October 26, 2011, 01:43:21 PM »

I had similar problems with my 7400. 'Smith changed to a different magazine latch, (there are several different lengths) he said mine wasn't holding the magazine properly. Whatever, I can't recall ever having another problem.

gunnut69 · « **Reply #18 on:** October 27, 2011, 07:19:23 PM »

Is the bolt dragging on the next cartridge or the feed lips of the magazine? That's a cause for a failure for the bolt to close. The cartridge in the photo is completely clear of the feed lips and is nearly in the chamber. It is not binding.. The photoes of the oposite views of the rifle I don't understand. Any marks on the bolts underside?

Thebear_78 · « **Reply #19 on:** October 28, 2011, 08:55:45 PM »

have you tried it with a different magazine? Its been my experience that its almost always the magazines fault when these fail.

I got a 750 in whelen dirt cheap. It wouldn't work for anything when I first got it, would just vomit up all the live shells out of the magazine. Put a new magazine in it and it worked like a champ from then on out. I think a lot of times its just faulty springs in the magazines.

xeno · « **Reply #20 on:** October 29, 2011, 05:29:11 AM »

Remington had me send the rifle to Ahlman's gunsmiths in Minnesota on 10/17.
I called them yesterday and I was told they had looked at the rifle and then send it on to Remington's repair shop in New York. The rifle had just got to the repair bench there in New York, when I called.

I'm not sure what to make of the fact that the gunsmith at Ahlman's couldn't fix the thing, other than if it were something simple they would not have had to send it on to New York.

I'm going to call back Monday and see what I can find out.

xeno · « **Reply #21 on:** November 17, 2011, 09:06:17 AM »

I got the Remington 750 back yesterday, it was exactly one month after I'd 1st called Remington and UPSd it out.

Today, I took it out and fired 40 rounds through it with no stoppages.
Apparently, whatever was wrong with it they fixed.

The rifle wound up being looked at 1st by gunsmiths at Ahlmans in Minnesota, then they sent it on to the Remington gunsmiths in New York. Why that was necessary I have no idea. I asked people both at Remington and Ahlmans what had been done to it and got very little information -- just stuff about the magazine and cleaning the gas system.

If that is all they did to it than why did it have to go to the 2nd facility?

Dvivlamore · « **Reply #22 on:** March 26, 2012, 12:58:09 PM »

the 750 in 308 has a very large gas hole, there is brass filling the gas hole, once its cleaned out your gun will shoot fine, take out the allen remove the ball on the inside then send through a "41 drill you should be fine