Web bump

C

craigrowe58

Member
I cannot bump the web of my case (6x47lapua without bumping the shoulder more than I like(.001),this is a custom chamber and the die made by my smith was made from the reamer used to chamber the rifle.Tried a (redding) body die and it will not do it either,is there a way to fix the die or what needs to be done? I only want to bump the web 001 or less so the cartridges will chamber easier.
 
Sounds like you need a die with a smaller base that the die that you have.
No way to fix yours, it needs material added.
You need another die.
 
I had a similar problem when I spec'd the reamer to match my brass. Had I let the brass expand a couple thou at the web, it would probably worked. But my Redding die (300 WSM) did not touch my fired (WW) case.
New reamer, Norma brass, worked.

Jay, Idaho
 
Open your chamber

I am told one can polish their chamber out a thou or so and this will allow your dies to work. I had the same problem last year and had my die rebuilt ( Jones). I am sorry now I didn't just have the chamber polished out a bit.

the other thing you might be able to do is to buy a small base die for a similar chambering. I used a 308 small base die to shrink mine when I had the problem.
 
Oops'' I just re read your post...

You can not make a sizing die with your chamber die... you can make a nice seating die though.

You have a classic problem when a super tight custom chamber is cut... then you need a super tight custom die made.

I would simply polish out the chamber a bit... or buy a sizing die made from one of your fired cases...

.
 
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craigroweugene said:
I cannot bump the web of my case (6x47lapua without bumping the shoulder more than I like(.001),this is a custom chamber and the die made by my smith was made from the reamer used to chamber the rifle.Tried a (redding) body die and it will not do it either,is there a way to fix the die or what needs to be done? I only want to bump the web 001 or less so the cartridges will chamber easier.
Click to expand...


Surprisingly enough there are still "gunsmith's" who believe that you can make a sizing die from your chamber reamer. Only ONE man that I know of can actually do this, Jim Carstensen of JLC Precision. He can cut a die using your chamber reamer and then shrink it to fit.

STOP using your "bump die" as a resizer before you start popping cases apart. It cannot do the job. It was money ill spent.

As has been mentioned, another "fix" would be to polish the chamber out a couple thou, or have the gunsmith single point it out a thou......

al
 
He did say

Dennis Sorensen said:
Oops'' I just re read your post...

You can not make a sizing die with your chamber die... you can make a nice seating die though.

You have a classic problem when a super tight custom chamber is cut... then you need a super tight custom die made.

I would simply polish out the chamber a bit... or buy a sizing die made from one of your fired cases...

.
Click to expand...

A Redding body die wouldn't do the job either. One of the plusses of the 47 Lapua case is or should be the ability to buy dies off the shelf, albethem pricey but less so than "Custom". I would appear that the reamer was ordered too small if a Redding die won't re-size the cases.
 
Silly question I suppose

craigroweugene said:
I cannot bump the web of my case (6x47lapua without bumping the shoulder more than I like(.001),this is a custom chamber and the die made by my smith was made from the reamer used to chamber the rifle.Tried a (redding) body die and it will not do it either,is there a way to fix the die or what needs to be done? I only want to bump the web 001 or less so the cartridges will chamber easier.
Click to expand...

But are you sure your cases aren't too long? Have you looked at this aspect?

Your cases should be at a minimum .005 shorter than the chamber.
 
It's not that hard to make a "base only" resize die. For example, get a cheap .308 or whatever small base die, and cut off the part 1/2 inch above the base. Or have the smith make on up with a carbide mini boring bar, starting with a .300 Savage die, whatever. Or you can just use a boring bar on a blank, skipping hardening, keep things clean & lubed, & ignore scratched cases . . . This die doesn't have to be "full length."

It is a pain to use such a combination. You have to size the cases twice (at least), once with the "regular" die, then with the base die. If you're really unlucky, again in the regular die after the SB die. Yes, I got the T-shirt.

A bit cheaper that both a new reamer & a new die is, as others have said, A custom Carstensen FL die. He does use the chamber reamer, then shrinks in a thin sleeve.
 
Get a cheap full length die, drill out the die at the shoulder about .010 and cut .100 off the base of your die. This will allow you to size further down on the web.
Butch
 
Pete Wass said:
But are you sure your cases aren't too long? Have you looked at this aspect?

Your cases should be at a minimum .005 shorter than the chamber.
Click to expand...



WHOAHHHH PETE!!!


Dude's talking about the SHOULDER, I hope you're talking about the NECK???

al
 
alinwa said:
WHOAHHHH PETE!!!


Dude's talking about the SHOULDER, I hope you're talking about the NECK???

al
Click to expand...

Would you base a case length on it's length at the shoulder? Case length is case length. Ifn the cases are too long, it can seem that there is a problem with shoulder position and even web problems. Have the tee shirt :D .
 
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Chambering problems are usually a sizing problem at the shoulder, extraction problems are usually from the base or web being tight. It has been my experience that once a piece of brass has been swaged to tight by several firings, till the web is tight in the chamber, There is little a die will do to change the dimensions at the web. A die will only change dimensions where the web transitions to the cavity and above and will massage the web very slightly which is why a properly made sizing die should be used after every firing to prevent the web or base from swaging to tight.
 
THANKS all of you

I knew I would get good ideas and answers from some reputable names here. I want to say that I really don't have any problems chambering or extracting (none) I just think that a bat action and a custom chamber would provide a smooth transition that would prevent my cross hairs from being off the spot so much when trying to shoot as fast as conditions allow.cases are not long,shoulder is being bumped .001 and the bullets are just nipping the lans,but the web remains the same,once read or understood that webs should be decreased between .0005-.002 and I cannot do it with this die.
 
So, whatchya gonna do?

After the advice offered, what do you think you might do to correct the situation?

Can you work the action without cases and have it not move the crosshairs? Have you "Slicked" the action up so that it is as smooth as it can be?
 
Thinking

I am thinking of sending cartridges to Harrell's and tell them to make me a die to bump the web only 001 or less,as you asked Pete everything else is just fine crosshairs stay on the mothball but I did not do anything to smooth the action,this is my first custom action and I have never owned anything smoother,one of my two smith's say that it should be bumped 001-002 and the other says 2tenth's is enough,I will ask the one that build the rifle how he feels about polishing the chamber at that area,but maybe then the die would not go low enough.Give me your 2 cents.I also like the idea of cutting down the die at the base .100 but if it is hardened(not sure) it would have to be ground.
 
Pete Wass said:
Would you base a case length on it's length at the shoulder? Case length is case length. Ifn the cases are too long, it can seem that there is a problem with shoulder position and even web problems. Have the tee shirt :D .
Click to expand...

If'n his cases are so long he's feeling them then he's crimping on the bullets..... his problems will be bigger than "tightness unsettling the crosshairs!!" Yeahhh, that could produce some "web problems..."

LOL

al
 
I also don't see how you can re-size the head of the case ( the web area)......this portion of the case in not in the annealed state.....and I believe would require a massive press.
I find it hard to believe you don't have issues with a sizer made with the same chamber reamer as used on your barrel.
Either your expectations about "upset" were unrealistic or your rest/bag set-up has "issues".
 
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