Help! Bullet Damage in my TL3

[chris514scott]

This is new TL3-3 I bought a few weeks ago. It's sitting in an Manners CS2 with Mini Chassis. The magazine I have at the moment is the accurate mag that came with the stock. The issues in the pictures have happened since the day I built the rifle. I did trim back the feed lips on the mag to see if allowing the round to engage the CRF sooner would help alleviate the problem and it hasn't had any effect whatsoever. I don't know if I need to try a different magazine or what.
I have attached pictures of the following:
* Magazine fully loaded
* Magazine in the action
*The round hitting the feed ramp
*Bullet damage from running action fast
*Bullet damage from running action slow
*Copper build up on the feed ramp.

The damage seems to be happening on every round.

Any help you can provide would be greatly appreciated

 

[King_beardsly]

Looks like it might be catching as it goes into the chamber, causing the chatter marks. Does the chamber have a burr or any sharp edges? Also do you have any other magazines or can you barrow one to see if it’s just an issue with the magazine, because it looks to me that the case is sitting to high out of feed lips.

 

[loveha]

Wouldn't be wild about doing this with a new action, but a cratex tip and dremel and smooth that out.

 

[Wheres-Waldo]

You need a chamfer on that chamber my man ?
Either that or the feed ramp in the action is sharp...

Let us see a close up of the very ass end of the chamber...

 

[plinkin]

Here's a pic of mine, done think I've ever had that prob, although it looks like there has been some scrapes. I'm running a aics 5 rnd mostly. Try another mag first.

 

[chris514scott]

Looks like it might be catching as it goes into the chamber, causing the chatter marks. Does the chamber have a burr or any sharp edges? Also do you have any other magazines or can you barrow one to see if it’s just an issue with the magazine, because it looks to me that the case is sitting to high out of feed lips.

You need a chamfer on that chamber my man ?
Either that or the feed ramp in the action is sharp...

Let us see a close up of the very ass end of the chamber...

It's not the chamber. You can see it the edge of the feed ramp causing it. Unfortunately this is the only mag I have. I was going to buy more buy wanted to see which one would be best if it was indeed the magazine causing the problem

 

[Wheres-Waldo]

I’d be hesitant to buff anything out of the action before at least trying another few mags, but I think you narrowed it down.

 

[plinkin]

I wonder could the mag/bottom metal be set too far down, causing the bullet to drag more than it should.

 

[Steel head]

almost looks like a rolled burr At the top of the feed ramp.
I’d 100% smooth that out.

 

[plinkin]

Clean it up and do a cotton swap pass

 

[Sixfivesavage]

Try opening the mag lips up just a touch to get the whole round to present a tad higher in the mag, maybe a tad more at the front than the back but don't go too much since you already cut them back.

 

[King_beardsly]

I’ve personally had great luck with the MDT steel mags in my tl3

 

[47guy]

That’s possibly but unlikely...the mags run high in my PRS1.

I have a 5 rounder shoot me your addy I’ll send it if it works send the one that don’t back if it don’t work send it back.

 

[47guy]

Try opening the mag lips up just a touch to get the whole round to present a tad higher in the mag, maybe a tad more at the front than the back but don't go too much since you already cut them back.

look at the first pic...the lips are opened about as much as they can be without rounds popping out

 

[Sixfivesavage]

look at the first pic...the lips are opened about as much as they can be without rounds popping out

That's true, I missed that one.

Something else to check is the leading, underside edge of the extractor. When you run the action slow, see if you can get an idea of when the case head is actually being taken control of by the extractor. I seem to remember there being an issue occasionally with the geometry there and the action will operate as a push feed so to speak a bit longer than it should and that's where the issue was.

 

[Dopedude]

What is the tang thickness? If it’s not a trim tang you might need to have some inlet work done.

 

[WDE6mmShooter]

I had the same issue with one of my TL3s. The feed ramp / action bore transition was fairly sharp. Had that transition area polished to break the edge and the problem went away. This was on a non DLC coated action, so the polishing wasn't noticeable from an aesthetic standpoint.

 

[b6graham]

What is the tang thickness? If it’s not a trim tang you might need to have some inlet work done.

Normal tang is just fine in a minichassis

 

[jbailey]

When I opened this thread I was worried I would see an Big Horn action that took an impact from a fired MOVING bullet.... I'm glad to see this worse case isn't what happened.

 

[chris514scott]

Just wanted to update you all. I bought an MDT metal magazine and it all but eliminated the problem. I can now run the bolt as fast as I want and there will barely be a mark on the bullet. The MDT also feeds like butter compared to the Accurate Mag

 

[spife7980]

So get the calipers out and measure the dimensions in feed lip widths and lengths and see where the accurate mag is different.

Bend to match and see how it does then.