Shoulder bump FL sizer problem

[big5ifty]

I may be worried about a problem that I don’t have. I may resize and start shooting.Thanks.

If your brass is chambering properly, why are you trying to bump the shoulder ?

 

[coldboreshot]

This situation is not the result of annealing and annealing here will not correct this issue. The die should be able to bump the shoulder, annealed or not so let's remove annealing from the equasion.

 

[BoydAllen]

Which shell holder plate-set number for 270 win.?

These would not do you any good because the set includes one standard shell holders and the rest are taller in increments of .002.

 

[K22]

4 suggestions. First does the fired(primer removed, brass not sized) case chamber properly?
If so shoulder doesn't need bumping.

This ^^^^^^

 

[swd]

Your die was reamed too deep. It's a lot more common than people think. I have seen them take as much as .027" to get any shoulder set back. Most need .010" or less. You can either take some off the bottom of the die or shorten a shell holder. I usually shorten the die. If you get past the champher it needs to be re established and polished or it will shave brass.

 

[dellet]

Measure brass new before and after firing. That will probably answer your question. Not uncommon for new brass to be undersized. It may be growing with out you knowing, and will need multiple firings.

Back the die off the shell holder a turn from contact.

Size and measure.

There’s a a good chance the shoulder has pushed forward, at least from fired length, hopefully also from new length.

Try that in your chamber, if it fits shoot it and repeat until it won’t chamber after sizing. Then work the die down until it fits.

 

[Allen Roberts]

Measure brass new before and after firing. That will probably answer your question. Not uncommon for new brass to be undersized. It may be growing with out you knowing, and will need multiple firings.

Back the die off the shell holder a turn from contact.

Size and measure.

There’s a a good chance the shoulder has pushed forward, at least from fired length, hopefully also from new length.

Try that in your chamber, if it fits shoot it and repeat until it won’t chamber after sizing. Then work the die down until it fits.

I have 20 recent fired 270 win cleaned, resized pieces of brass. I have separated the neck sizes of each piece into 3 groups. Those with the shortest neck and measure closest to the neck size of a brand new unfired piece of brass glide and close in the chamber. Group 2 neck measurements are longer but still fit and close the chamber with nominal resistance. Group 3 is the hardest to close in the chamber, but they will close with some effort. I have tried a Lee FL die and an Rsbc FL die. I have lowed and raised the dies and I have not pushed Back the shoulders on any piece not even.001. Nothing. I f I continue to turn down the die, my press handle has a short rather than a full press . The neck measurements stay the same. I am getting nowhere on bumping back the shoulder

 

[charlie b]

I had the problem of a short chamber in 6.5CM. Factory brass (Peterson) would not chamber and running it through a Hornady sizing die didn't help. I bought a Lee die and it didn't work either.

Nothing to lose so I ground off the base of the Lee die until I could chamber an empty case. Has worked fine ever since.

 

[Coyotefurharvester]

What is the neck size reference, thought you can't get any shoulder bump?? Neck has nothing to do with headspace shoulder bump.

 

[Allen Roberts]

What is the neck size reference, thought you can't get any shoulder bump?? Neck has nothing to do with headspace shoulder bump.

I have 10 pieces of resized brass that are hard to chamber. How can I bump the shoulder back to a respectable reading. Unfired brass reads approximately 2.042 on my Hornady gauge. My brass measures 2.050.

 

[dellet]

I have 20 recent fired 270 win cleaned, resized pieces of brass. I have separated the neck sizes of each piece into 3 groups. Those with the shortest neck and measure closest to the neck size of a brand new unfired piece of brass glide and close in the chamber. Group 2 neck measurements are longer but still fit and close the chamber with nominal resistance. Group 3 is the hardest to close in the chamber, but they will close with some effort. I have tried a Lee FL die and an Rsbc FL die. I have lowed and raised the dies and I have not pushed Back the shoulders on any piece not even.001. Nothing. I f I continue to turn down the die, my press handle has a short rather than a full press . The neck measurements stay the same. I am getting nowhere on bumping back the shoulder

This is a little confusing, you should be measuring from the base of the cartridge to the middle of the shoulder, the angled part, this is the body. If you are measuring the length of the neck, from the case mouth where the bullet goes, to the neck it might make some sense.

You need to measure the full length of the case and match it to the diagram below. The case length should be no longer than 2.570”.

The other number you posted for fired brass looks normal 2.050”. No reason to bump that back. Unless diameter is the problem.

In the post I quoted, you said the brass with the shortest neck fit the best. Did you mean the ones that measure 2.042”? These should have the longest neck.

This is very important to get right. If the longest case 2.050”, also has the longest neck, the problem might be the neck is too long.

 

[swd]

I have 10 pieces of resized brass that are hard to chamber. How can I bump the shoulder back to a respectable reading. Unfired brass reads approximately 2.042 on my Hornady gauge. My brass measures 2.050.

Sounds like your die needs .011"-.012" taken off the bottom of the die for spring back and a little extra so you can back the die off slightly. Check you pm's.

 

[Coyotefurharvester]

You said you have 3 groups of brass, but don't give comparator lengths for each group. Generally new brass, whether factory ammo or component brass, is minimum SAAMI or close to it. No need to size back to it after firing(unless the fired brass is hard to chamber). I have custom minimum SAAMI chambers in a couple rifles and have no issues with standard RCBS FL sizing die keeping brass "short enough" to chamber.
Trim 0.005 inches off(overall length no primer) a tough to chamber piece of brass, see if it chambers easier.
If it does you know you have a length issue to watch for.
Still need to tell us your die adjustment/setup method. How applied/what lube used?
I honestly in (50+ years of reloading) have not seen this type of problem.
Die set part # ?
It is possible that the die is too long, turning the die past cam over(shell holder contact plus 1/8-1/4 turn) will result in brass getting longer and harder to chamber. Shortening the die will force the case into a smaller diameter, trimming will be required as the brass moves up the case. RCBS would probably just send you a new sizing die if you call and explain to tech your issue.

 

[dellet]

After reading this again this morning a couple new questions.
If you are using the Hornady .375 insert and the fired brass measure 2.050”, length should not be a problem, it may be diameter.

You stated that your press has a short handle. That can be a problem. Screwing the die down farther will will only make it harder the full length size the brass, you lose needed leverage.

You stuck one case so bad you replaced the die. This was either not set up properly, or not enough lube was used. It’s possible to have the expander set up where it pinches the case between the expander and case neck.

It’s not likely that two different dies would be both machined improperly, but possible.

What’s more likely is that when your press handle is all the way at the bottom, you can look between the shell holder and die and see a gap. If this is happening, you need more, then more leverage. Possibly a press that doesn’t not flex.

 

[SKWERLZ]

I may be worried about a problem that I don’t have. I may resize and start shooting.Thanks.

Sometimes that happens.

 

[243winxb]

My brass measures 2.050.

IF needed reduce gap .002" more, to easly close the bolt.

Turn the fl die down .002" more. The gap between shell holder and die was started? at .005" If following my method.
(throw Hornady gauge away)

The Hornady gauge has nothing to do with SAAMI specifications.
Gauge is to compare fired to sized brass, nothing else. Post #31.

 

[243winxb]

What’s more likely is that when your press handle is all the way at the bottom, you can look between the shell holder and die and see a gap. If this is happening, you need more, then more leverage. Possibly a press that doesn’t not flex.

OP said he tried turning the die down, more then needed. But there may still be a gap between die and shell holder. Like this Lee press.

Possibly a press that doesn’t not flex.

Turning fl die down more, does NOT fix it. Try RCBS 2 Lube.

Forster Universal Co-Ax Reloading Press with S Jaws, short handle, can be a problem also.​

 

[dellet]

OP said he tried turning the die down, more then needed. But there may still be a gap between die and shell holder. Like this Lee press.

Turning fl sie down more, does NOT fix it. Try RCBS 2 Lube.View attachment 1695664

The comments about short handle, the stuck case in the other die, adjusting the die until the handle only goes halfway where there is no leverage, kind of make you wonder. Could be a bad die, but would have to be two bad ones from different manufacturers

And if the 2.050” number is any where close to correct, he should be able to touch that

Maybe this press