Not feeding from a blind mag.

[DonnyJ]

I have Remington 700 SA. After having a barrel installed. I installed the barreled action in a B&C BDL stock.
Now I'm having an issue chambering a round from the blind mag. Sometimes it works great and sometimes the bolt will skip right over the round in the mag.

Any advice on what I need to check or what could be causing my issues.

Thx

 

[cahunter805]

Sounds like the follower spring needs some tweaking. It should look like a W. Also check to make sure the stock isn't pinching the mag box on the sides of the box.

 

[joshb]

Check those issues and also the depth of mag well against the old stock.

 

[Ggmac]

What happens when 3 or more rounds are in it , does it skip over the last round but function fine on the first , second or third ?

 

[shortgrass]

I have Remington 700 SA. After having a barrel installed. I installed the barreled action in a B&C BDL stock.
Now I'm having an issue chambering a round from the blind mag. Sometimes it works great and sometimes the bolt will skip right over the round in the mag.

Any advice on what I need to check or what could be causing my issues.

Thx

Was the new barrel chambered for the same cartridge as the one that was removed?

 

[DonnyJ]

What happens when 3 or more rounds are in it , does it skip over the last round but function fine on the first , second or third ?

There doesn't seem to be a pattern. Sometimes its on the first and then next time it'll be on one of the next 3 rounds.

Was the new barrel chambered for the same cartridge as the one that was removed?

No Sir. It started as .308. I had the action trued and turned into a 6.5Creedmoor.

I notice that if I push on the front or rear of the follower. it seem to dip down without much effort on my part.

 

[Ggmac]

Try this , it sounds like the depth of your blind mag is more than your old one or more than the spring can handle .
Take sone foam rubber , flip flops , exercise matts , etc cut to fit UNDER the spring , in between the floor of the blind mag and the spring .
The foam spacer should be about 1/2-3/4" thick and shaped like the mag spring bottom .
What this does is shim your spring giving it more strength . Yet it'll give I've you load 4-5 rounds .
It's a temporary fix to eliminate a weak spring .

 

[Jesse Gietzen]

It started as .308. I had the action trued and turned into a 6.5Creedmoor.

I notice that if I push on the front or rear of the follower. it seem to dip down without much effort on my part.

this is my prediction. if you look inside your magazine box, you'll see some rub marks where the box tapers into the creedmoor case shoulder, causing a pinch point. when loaded, the base/rims are loose and can be pushed down and won't spring back to the top.

this is basically the reason people have feeding issues with ackley cartridges. the shoulders are wider than the magazine was designed for, causing that pinch/pivot point. from the base to the shoulder, your box needs to run parallel with the case. i fixed this on bdl mags by putting something round (turned down barrel scrap, electrical conduit scrap, whatever is round and sturdy) through the box right where the rub marks are. i squeeze the mag box (gently, but firmly, ish? that mag metal is pretty stiff) until that taper has been forced parallel behind the shoulder. you still need some taper toward the front, as that kicks the rounds out from under the receiver's feed rails.

i would not be surprised if there was a better way to do this. a sheet metal worker can probably bend it ten better ways and make it look good. all i know is i need to blow out the pinch point but retain some taper forward of it.

i've also used wyatt's straight walled mags but typically have to add a little taper towards the front. when i'm done they do not look "factory" but they do feed well. i don't have a ton of experience but have gotten a couple of dozen of creedmoors, 223ai, 280ai, etc... to feed beautifully by letting the magazine better mirror the cartridge taper.

 

[FeMan]

I had a similar issue and it turned out that the mag box was not seated firmly in the receiver recess.

 

[shortgrass]

There doesn't seem to be a pattern. Sometimes its on the first and then next time it'll be on one of the next 3 rounds.



No Sir. It started as .308. I had the action trued and turned into a 6.5Creedmoor.

I notice that if I push on the front or rear of the follower. it seem to dip down without much effort on my part.

I'd probably start with a new spring. But that may not be the complete cure. I've never had problems getting a Creedmoor to feed from a .308 box set-up, nor have I had much problem getting an Ackley to feed properly, even those that the interdnet says "can't be done". I'm not a big fan of those stamped followers Remington uses on some of their models, and usually replace those. Likely, your problem is the lips on the mag box, itself,,, other than the possible weak spring. Bend the lip inward, and it will force more of the cartridge up and towards the center. Bend the other way, and you get the opposite result. Lastly, you might need feed rail work to make it feed 'slick'. Remember, you can't put metal back, so work slowly checking often. Feed issues can take time and are often very misunderstood, there is rarely an 'instant' cure. Sometimes you get lucky, sometimes it just takes time and understanding the feed cycle and what needs to be done to make it work as desired. The feed cycle and feeding issues,,,,, probably the most misunderstood task, least known thing in gunsmithing repeating rifles,,, only surpassed by stock making.

 

[DonnyJ]

After some disassembly and inspection and using the suggestions from above!

I found the mag box was pinched in up front and the follower was dragging on the box. I put the box in a soft jaw vice with enough pressure just to hold it in place. Then pushed a 1/4 drive 12mm socket the length of the mag box. That opened up the front of the mag box about .020. The follower still comes in contact with box but there's no resistance. This seemed to have reduced some of the see saw action in the follower.

Also, I noticed that the case sets low compared to the line the bolt must travel on action raceway. I checked this against another Remington I have and the base/ rim of the case goes it edge of the lip on the bolt nose. I filed off .010 from the top of the follower and that allowed the follower to go higher pushing the round further up in line with the bolt.

So my question is.. How much of the bolt nose/ lip should be covered by the rim of the case?

Thx

 

[Sniper338]

Just enough to make it function right. Some catch onlt the lip of the bolt face, some come up past the lip some... enough to make it feed is your answer...

You can also try not putting the rounds to the back of the mag all the way if you have room.

I agree with alot of the above... even AI cases and 6BR feed flawlessly if set up right. I have guns doing both.

 

[DonnyJ]

Well.. That didn't work!

The round sets low in the mag! When you push the round down into the mag so the it catches under the side of the action. The piece of brass will rock back and forth just enough to allow the base of the case to drop below the bolt nose. The pivot point is the shoulder. I even tried a different follower and got the same result.

 

[243winxb]

The creed round has less taper and is fatter near the shoulder than the 308, by about .008" (SAAMI) The magazine diameter may need to be opened??

Seen where neck sized brass would not feed from the magazine, but full length sized ammo would. Staggered magazines are more likely to do it. Not a common problem. But have personally seen it.

 

[243winxb]

** Some magazines will have an indent, that keeps the round from moving towards the chamber under recoil.

Think of a litte piece of the magazine sticking out just enough to make contact with the shoulder.

If your magazine has one, ?? the shorter Creed will move forward more under recoil, till it makes contact.

Make sure the new stock is not making the inside diameter of the magazine smaller.
I think my Rem 600 magazine is open at one end** . Would be easy for a new smaller stock to close the inside diameter of the magazine.