[jon8777]

Long story short, I have been having troubles with a 223 rem brl for my Encore...

Tonight I went out to reload a few rounds to hunt with tommrow morning. After a quick run of once fired brass I wiped off the lube and did a once over visual inspection... 75% of the cases had the land and grove marks on the mouth of the case.

I trimed my cases to 1.760" on the last load, and the marks start at the 1.745" on the once fired brass....

Anyone have this happen to them???

[243winxb]

Anyone have this happen to them??? Nope. http://www.thehighroad.org/showthread.php?t=437133 Should be good for in the garden as a tomato stake. Could it be this same barrel? http://www.thehighroad.org/showthread.php?t=431272

[Sunray]

"...trimed my cases to 1.760"..." That's too long. 1.760" is the max case length. Trim-to is 1.750".

[R.W.Dale]

if all else fails you could rent a .223 chamber reamer and headspace gauge, remove the extractor and run the reamer in far enough to open the throat up to spec

[jr_roosa]

Some factory crimps can look like rifling marks.

-J.

[jon8777]

243x its the same brl... called TC a few times about it and got no response.

JR- its 6 lans and groves... not a facotry crimp (hand loads)

[Walkalong]

Just trim your brass to fit your barrel. No big deal unless it gets way to short to hold a bullet well. Trim to 1.740 (only .010 under normal trim length anyway), or maybe even 1.735 for added safety.

[243winxb]

Some factory crimps can look like rifling marks. yes they can. And the Lee factory crimp die might make the same marks,maybe?? Don't own one. And trim too length is 1.750" as said above. Last but not least, get the reamer after making a chamber cast if needed.

[Chawbaccer]

If the mouth of the case is being marked, the bullets themselves would really have to be jammed into the rifling. All I can think of is the chamber wasn't cleaned up fully. How is the head space, did you checik it with a guage?
TC should want to take a look at this one.

[rcmodel]

-1

That sounds like a bad situation waiting for a pressure excursion to happen.

The bullets would definately have to be getting fully engraved before the case neck could possibly contact the rifling.

But I don't think it's the rifling marking the case. The leade removes the rifling forward of the chamber for a short distance so the is no rifling there that could possibly contact the case mouth.


Could just be some hard fouling in the chamber.
Were I you, I would take a bronze .40 cal bore brush & solvent in a drill and give the chamber a really good going over.

If that don't fix it, send it back to T/C with some of the marked cases for them to look at.

Another thing to consider is your sizing die is scratching the case necks due to galded brass stuck in it.

They can be polished out with a slotted dowel rod and some 400 emory paper flaps & the drill.

rc

[NCsmitty]

If possible, a picture would be nice to help explain the deformations or irregularities on cases, so we can see what you're talking about.

NCsmitty

[Coltdriver]

It was not until I started reloading that I discovered that very few chambers are exactly perfect.

So now you know to trim your brass a bit.

The other problem that some Thompson barrels have is little to no throat or sometimes a throat that has one rifling land a bit long which will make your rifle shoot poorly.

If you look up mike bellm on the web he has a fabulous site and he does all kinds of accurizing work on Thompson barrels. One of the things he rails about the most is the throat issues on so many of the barrels.

You can take a round with a bullet seated long, paint the bullet with black majic marker, chamber it, take it out and see where the lands marked the bullet. If you get one land mark that is lower down on the bullet you may have this issue.

I have a .243 Ruger that had a chamber much shorter that the spec version. So I now measure all of my chambers so that I get the headspace right and the bullet seating right.

[Borg]

Unless the chamber is grossly out of spec,(.030, or more) AND, the case almost a quarter inch too long, there's no way a case can enter the throat.
I say left over factory crimp.
Borg

[45ACPUSER]

Do a chamber cast and get some hard data!

[jon8777]

Dont need to cast the chamber.... the brass did it for me!!!

http://i133.photobucket.com/albums/q76/jon8777/dimensioncopy.jpg

http://i133.photobucket.com/albums/q76/jon8777/closeup.jpg

[Ol` Joe]

How many lands are there in your bbl? It appears to be a 3 land bbl, if not... that sure looks like a crimp.

[JonB]

So if you chamber a round and then eject it, what does the bullet look like? If the case mouth is getting jammed in to the rifling, the bullet has to be in even worse shape.

[depoloni]

Those are sure as hell crimp marks - either leftover from previous ones or from the current loading process. I have and shoot a half dozen different T/C barrels on two actions. There is NO feasible way, unless you're telling me the guy's SLAMMING his action shut hard in order to fully lockup the action (and thus allow him to cock the hammer/fire) that the rifling in his barrel, or more specifically the rifling lands, is doing that to the cartridges.

Don't even sweat it. Even a bullet jammed into the rifling in the T/C actions requires one shut firmly, if not "clap" the thing, to get the lockup required to allow the hammer to be cocked. Doing the same thing to the brass itself would certainly require as much or (much) more force for the same reason.

[jon8777]

Joe-

6 land brl, counted it 3 times to be sure.


Jon B-

I can drop the loaded round into the chamber (off the frame) and it sits flush with the face of the brl. If I load a round into the chamber (on the frame) and pull it out it looks and measures the same.


Depoloni-

I dont slam te action shut, I gently let it snap close and feel for any case problems... my final check after loading it as a last check before I pull the trigger.

[SDC]

That's a standard military neck crimp; what's the headstamp on the case?

[jon8777]

Its Remington UMC 223 remington 55gr. mc l223r3

[Sport45]

Pull a new round of UMC .223 out of the box and I'll bet you see the same marks at the case mouth. It's from the crimping process.

[jon8777]

Its "R-P 223 Rem"... I'll have to stop at the gun shop and look at a box of them

[Walkalong]

Definitely a crimp.

Besides, with rifling, the skinny parts would be deeper, not the wide parts. :)

[jon8777]

Trim the brass to 1.730, leave it and shoot it, pitch it?

[Walkalong]

Trim it to 1.750 and shoot it.

[Kernel]

Looks like factory crimp marks to me. I have a lot of Winchester .30-30 brass that looks exactly like that (gotta admit I've never noticed it on any .233, though, milsurp or otherwise). Those marks never go away no matter how many times the cases are sized, trimmed, & re-crimped. Heck, even my 7-30 Waters brass formed from .30-30 cases has those marks.

[Borg]

Left over factory crimp! LOL
Borg

[243winxb]

leave it and shoot it, trim to 1.750 after FLRSing

[JonB]

Besides, with rifling, the skinny parts would be deeper, not the wide parts.

That's what I was thinking too, but wasn't sure if there were different types of rifling that would match that pattern.