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RCBS

Are you saying the measurement from the cartridge base to the shoulder datum is 20 thou longer ?
Something does not make sense. Dies do not make he CBTD longer by 20 thou. Cartridge OAL I can see, but a longer shoulder measurement ..... not so much. But I guess anything is possible.
Before pic with measurement methods in place (e.g., show what and how you are measuring cases with) and after with the same measurement methods in place would be helpful.
Actually if your die sizes the neck a lot then the expander pulls hard back through the neck it will lengthen the datum, .020 would be extreme but I have seen movement. Lube works wonders even if the die is over sizing
Wayne
 
Are you saying the measurement from the cartridge base to the shoulder datum is 20 thou longer ?
Something does not make sense. Dies do not make he CBTD longer by 20 thou. Cartridge OAL I can see, but a longer shoulder measurement ..... not so much. But I guess anything is possible.
Before pic with measurement methods in place (e.g., show what and how you are measuring cases with) and after with the same measurement methods in place would be helpful.
Whatever is causing the longer shoulder, most likely stretch in firing, the die won't bump it down to the appropriate length is what is happening.
 
Whatever is causing the longer shoulder, most likely stretch in firing, the die won't bump it down to the appropriate length is what is happening.
It’s not all that uncommon to not be able to set the shoulder back without removing some off your shell holder
Wayne
 
Simplify -
What are all the measurements on your ammo before firing (pull the bullet if needed) ?

What are all the measurements on your ammo after firing ?

Pics helpful of the tools you are using while being used.

Black the case and run it in the die 1/2 way

Black the case and run it in the die 3/4 way

Keep doing that until you contact the shell holder

Measure after each insertion and write it down.
 
Maybe that small base die in the 223 is part of the problem, too much sizing at once might be bending your brass. It may need to go through your old die first before sizing it with the small base set, your rifle may not even need the brass sized with the small base dies.
 
I sincerely would like to help you, but this can and will go on forever. Nothing makes sense to me. I could ask about 10 questions, but I am reluctant since something is being lost in the communication judging from other posts.

It could be a multitude of issues and maybe easily remedied. Before you start grinding on shell holder and modifying dies you should try to seek out an experienced reloader and have them examine the issue rather than trying to solve this via the net.

I have literally loaded thousands of rounds of bottle neck rifle cartridges in a multitude of calibers over the pass 50 years using RCBS dies and never had one single problem, and I never modified the dies or shell holders. That's not to say that your problem could not be caused by a defective die, today, anything is possible, but I doubt it's the die or shell holder.

Furthermore, having dealt with RCBS over 50 years, I never had them charge me anything for their equipment issues even in some instances the issue was my fault.
 
Ok...one last thought...are your decapping stems contacting the cases before they are completely inserted into the dies? Did that once with a set of dies and about drove myself crazy until I realized what was wrong. Felt like an idiot. Back your depriming pin out until it just knocks out the primers and your brass has entered the die as far as the shell holder allows
 
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Like TTE said, pictures of brass & equipment would help.
Exactly, because I think I can say that not one of us is clear as to what the original poster is trying to say, or what his problem is. An image might mean that we could see the problem and quickly figure it out and offer a simple solution. A lot of us here have a lot of loading experience and have already seen or had happen many of the more common problems.

Danny
 
I sincerely would like to help you, but this can and will go on forever. Nothing makes sense to me. I could ask about 10 questions, but I am reluctant since something is being lost in the communication judging from other posts.

It could be a multitude of issues and maybe easily remedied. Before you start grinding on shell holder and modifying dies you should try to seek out an experienced reloader and have them examine the issue rather than trying to solve this via the net.

I have literally loaded thousands of rounds of bottle neck rifle cartridges in a multitude of calibers over the pass 50 years using RCBS dies and never had one single problem, and I never modified the dies or shell holders. That's not to say that your problem could not be caused by a defective die, today, anything is possible, but I doubt it's the die or shell holder.

Furthermore, having dealt with RCBS over 50 years, I never had them charge me anything for their equipment issues even in some instances the issue was my fault.
It's a new world corporately, eh? I am going to a very experienced reloader tomorrow, whose suggestion so far has been to grind down the shell holder. I am going with a new round from Hornady, a reloaded round I did, a fired case from Hornady, a fired case from my reloads, the shell holder and small based die set. We shall see. If any of my communications might have been less than clear to anyone, I try my best. I have NEVER had this problem before either. I have reloaded many, many, thousands of rounds and have learned a thing or two, yet still consider myself only somewhat experienced.
 
It's a new world corporately, eh? I am going to a very experienced reloader tomorrow, whose suggestion so far has been to grind down the shell holder. I am going with a new round from Hornady, a reloaded round I did, a fired case from Hornady, a fired case from my reloads, the shell holder and small based die set. We shall see. If any of my communications might have been less than clear to anyone, I try my best. I have NEVER had this problem before either. I have reloaded many, many, thousands of rounds and have learned a thing or two, yet still consider myself only somewhat experienced.
I meant no criticism - my only intent was to offer you a straighter path to solve this problem. An experience reloader should be able to identify the cause and save you a lot of time, grief and maybe expense.

As I said, this could be defective equipment and nothing you did incorrectly. Communication on the net is a challenge for sure. Even talking to someone via phone would be better but that is becoming extinct like the dinosaurs and me. In today's brave new world, text rules the world.

Best wishes.
 
Back up the bullet seater stem so the case has to go further into the die, this centers the bullet so the point does not catch edge of the seater thereby being pushed down crooked resulting in bent cases.
I have seen this movie!
 
Back up the bullet seater stem so the case has to go further into the die, this centers the bullet so the point does not catch edge of the seater thereby being pushed down crooked resulting in bent cases.
I have seen this movie!
Will try this. Thanks.
 

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