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rookeybr
Guest
Could anyone please help me figure out why the case ends are swelling making it difficult to open bolt? Thanks.
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rookeybr
Guest
the brass is lapua with neck trim to .0085 case length cut 1.495
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mike in co
Guest
describe the rifle, the caliber/cambering, the load, the bullet, bbl.
powder primer and anything else.
action
type of shooting...
lots of missing info.
how many times has the brass been fired ?
did it do it before ...when did it start, what changed ??
powder primer and anything else.
action
type of shooting...
lots of missing info.
how many times has the brass been fired ?
did it do it before ...when did it start, what changed ??
R
rookeybr
Guest
6ppc, bat action 2 lug, br competition, powder 133, doesn't matter what load.
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jo191145
Guest
Full length size your brass and try again assuming your necksizing now of course.
jackie schmidt
New member
Difficult Bolt Openning
Let me ask you this, are you sure it is in the chamber or cases. There is a key word in your post that makes me feel you might look somewhere else........jackie
Let me ask you this, are you sure it is in the chamber or cases. There is a key word in your post that makes me feel you might look somewhere else........jackie
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Larry Elliott
Guest
Along with everyone else's suggestions/ideas, I presume you mean that the cases are expanding at the web/head. This shouldn't be happening a good chamber unless the loads are too hot. If this happens even with lightish loads, primers with well rounded edges and all, then I'd say that you've got a bad chamber or a lot of overly soft brass. Lapua isn't known for soft case heads.
The more information you provide the easier it'll be to give a good answer.
The more information you provide the easier it'll be to give a good answer.
You've given us plenty of information 
Your chamber is too tight.
You can't resize it......
It can be fixed by enlarging your chamber, you have a poorly thought out setup.
Sorry, I'm sure I've stepped on somebody's toes with that one but it's the truth. The ceiling is when your primer pockets get loose..... if extraction gets tight before you lose the pockets then your chamber is too small.
al
Your chamber is too tight.
You can't resize it......
It can be fixed by enlarging your chamber, you have a poorly thought out setup.
Sorry, I'm sure I've stepped on somebody's toes with that one but it's the truth. The ceiling is when your primer pockets get loose..... if extraction gets tight before you lose the pockets then your chamber is too small.
al
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Larry Elliott
Guest
Al, depends on what the chamber looks like. I had a 6 BR live varmint barrel chambered by a guy who screwed it up pretty badly. Another guy cut the tenon off and rechambered it, and now it has normal bolt lift and extraction.
The second smith said that there was a groove in the chamber where the body and shoulder of the chamber met along with other problems. The first guy didn't give much indication of wanting to figure out what the problem was and I didn't really want him messing with it anymore.
The second smith said that there was a groove in the chamber where the body and shoulder of the chamber met along with other problems. The first guy didn't give much indication of wanting to figure out what the problem was and I didn't really want him messing with it anymore.
pbike
New member
I believe Alinwa is mostly right on here. A chamber has to be tight for us in BR, but not so small that your dies aren't small enough to size the case down. Another method is to periodicly run the cases through a die that is really small in the base, this die is sometimes refered to as a "Ring Die"... somewhat of a small base sizing die like what is used in auto rifles for function. I'll make up some figures, because everyone has a different idea on what the base size needs to be. Lets say your chamber measures .441 in the base area..., your case needs to be sized down to just about .439. If when you fire the round, the base expands out to a full .441, your round will be tight if it only fires out to about .4405, then you are fine. The problem is over time it will get work hardened so that as you size it down to .439, it springs back out to .440 or so and then you fire it, it becomes sticky in the chamber. That is when you either REPLACE the brass. Or use a ring die, the ring die might size the brass down to .438ish. Another problem is that the part of the case we need to size, is right at the bottom of the die/ Top of the shell holder. In a perfect world I would make the shell holder shorter and the die longer so I could size the brass down where it needs to be sized down. For now we just get new brass, thus the shortage from time to time on Lapua 6BR, and .220 russian brass. A lot of BR gunsmiths have gone to a lot of extremes trying to get the perfect chamber reamer and sizing die reamer combo.
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mike in co
Guest
notice he siad it did not matter what powder charge of n133?????
seems to me jackie is on to somehthing........
he did not say what it had done previously, if it was a new chamber, new brass or new dies.....
mike in co
seems to me jackie is on to somehthing........
he did not say what it had done previously, if it was a new chamber, new brass or new dies.....
mike in co
See area of your post highlighted in RED. Please correct me if I'm wrong, but I am under the impression when brass becomes work hardened it LOSES its abality to SPRING BACK and if sized down will stay there.
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alpacca45
Guest
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1000mstudent
Guest
I had a similar experience with my .308 win. A standard full length sizing die did not work. I went to a small base die and the problem cleared up. At the time I was using 12 gr of Unique and a 160 gr Lee cast bullet. I suspect that you indead do have a tight chamber. Use some cerrosafe and cast the chamber. You will know once you pull it out and measure it. I got my cerrosafe from Brownells for almost nothing.
You're wrong.
Springs are hard, and springy, they resume their shape instead of "staying there.".... folks anneal brass to get it to move and stay put. Annealing makes it 'malleable,; the opposite of 'springy.'al
pbike
New member
Shinny I might try to clear that up... As you fire the brass again and again it gets hardened (work hardened) to the size of your chamber. Each time you size it down it Springs back instantly to very close to it's hardened form which is now tight in your chamber. As I said earlier, time to replace the brass. Anealling (sp) is only on the front, you never aneal the base, soft bases are deadly.
Another problem that nobody has mentioned unless I missed it is the primer and the firing spring tension. If you have too much pressure (any amount of n 133)(which could represent too much) the primer cup flows back into the firing pin hole, that flowback, combined with a weak firing pin spring can cause a bolt to be very sticky on opening. In that case you would see a sizable extruded form on the fired primer. In many instances the case is stuck to the bolt face, unless and ejector is present.
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Randy J.
Guest
Nix the small base die
A small base die may size it down enough to chamber but if you have blown the case out too far with a hot load, it will be out there again on the next firing. Been there done it. Having a chamber with a slightly larger diameter near the base is the way to go. The cases only stretch so far near the web and if the chamber is too close to the dimensions of the brass, it won't be long before the click begins and stays. Al is correct unless it is something wrong within bolt as previously mentioned as well. Randy J.
A small base die may size it down enough to chamber but if you have blown the case out too far with a hot load, it will be out there again on the next firing. Been there done it. Having a chamber with a slightly larger diameter near the base is the way to go. The cases only stretch so far near the web and if the chamber is too close to the dimensions of the brass, it won't be long before the click begins and stays. Al is correct unless it is something wrong within bolt as previously mentioned as well. Randy J.