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Neck Bushings not the size you order??

Is it just me or does anyone else have problems with Redding neck sizing bushings not being the size that they say they are on the bushing?? I have ordered several of them over the years and they never seem to be the right size. I just ordered a .270 for my 6SLR and it measures .266 inside dia. What gives??? That's a lot more neck tension than I want for a .272 to 273 loaded round.
 
Raptor said:
Is it just me or does anyone else have problems with Redding neck sizing bushings not being the size that they say they are on the bushing?? I have ordered several of them over the years and they never seem to be the right size. I just ordered a .270 for my 6SLR and it measures .266 inside dia. What gives??? That's a lot more neck tension than I want for a .272 to 273 loaded round.

What did you use to measure it???

You really need to use a lead slug or a cerosafe casting.
 
CatShooter said:
You really need to use a lead slug or a cerosafe casting.

What are you talking about? You can measure the inside of a bushing just fine with a caliper or inside mic, especially one that is .004" off.

I have not seen any that far off, but I have read posts here of those that did. What I've seen is; Send it back. They should replace it with the correct one. Can you imagine having a barrel full of those things at the Redding plant and one of the wrong size getting accidently dropped in the wrong barrel? I can.
 
LRGoodger said:
CatShooter said:
You really need to use a lead slug or a cerosafe casting.

What are you talking about? You can measure the inside of a bushing just fine with a caliper or inside mic, especially one that is .004" off.

Caliper blades have a flat edge. With any kind of flat edge it won't accurately measure the inside of something that small.
 
I measured it with the same calipers that I measured the loaded round with. No, I have not used it yet. Unfortunately they sent me the wrong dies.

So, are you guys saying I can't accurately measure it with calipers??? Thanks for the replies!!
 
Raptor said:
I measured it with the same calipers that I measured the loaded round with. No, I have not used it yet. Unfortunately they sent me the wrong dies.

So, are you guys saying I can't accurately measure it with calipers??? Thanks for the replies!!

That's exactly what the man is saying, funny thing is he is right you can't...

Roland
 
If you think Redding bushings are lacking you should mic up a few of their shell holders.

A B&S IntriMic(3point) or small hole gauges would be a better choice for measuring the ID's.

Your dial caliper ID fingers will be closer than scaling the ID of your bushings.
(industry std for vernier/dial calipers is .003")
 
LRGoodger said:
CatShooter said:
You really need to use a lead slug or a cerosafe casting.

What are you talking about? You can measure the inside of a bushing just fine with a caliper or inside mic, especially one that is .004" off.

I have not seen any that far off, but I have read posts here of those that did. What I've seen is; Send it back. They should replace it with the correct one. Can you imagine having a barrel full of those things at the Redding plant and one of the wrong size getting accidently dropped in the wrong barrel? I can.

Big difference between a "Inside Mic" and a set of calipers.

RS
 
My earlier question is about Redding possibly including the "springback" factor of brass to produce a neck with the listed dimension...in this case .270. If a customer used their .270 bushing, and because of springback, the customer ended up with a larger diameter case neck than .270, then what would a customer say?
 
I've checked all my Redding & Wilson neck bushings simply by measuring the case O.D. after sizing, using a micrometer. Yes, there are some slight differences, the most I've ever seen is .001" (smaller or larger), the majority are .0005", not enough for me to be concerned. Some are exactly as stamped.

I've made notes of the "advertised" diameters and the actual sized diameters.
 
LRGoodger said:
CatShooter said:
You really need to use a lead slug or a cerosafe casting.

What are you talking about? You can measure the inside of a bushing just fine with a caliper or inside mic, especially one that is .004" off.

I have not seen any that far off, but I have read posts here of those that did. What I've seen is; Send it back. They should replace it with the correct one. Can you imagine having a barrel full of those things at the Redding plant and one of the wrong size getting accidently dropped in the wrong barrel? I can.

First, "Can you imagine having a barrel full of those things at the Redding plant and one of the wrong size getting accidently dropped in the wrong barrel? I can."

That is NOT how they are made. They cannot be "accidently" be dropped into the wrong bucket. Your imagination is working over time.

Second, what I am talking about is that very few people have proper gauges to accurately measure the inside of 1/3" tube to < 0.001".

Taking the same caliper that you use to measure case length with and trying to measure the inside of the bushing, is fools play - you will get nothing meaningful. It will ALWAYS read smaller than the true bore size.

Third, many people think they can measure the inside of a bushing, by measuring the finished sized neck - nothing could be more wrong - a case neck run through a bushing can be anywhere from 3 thou larger, to 6-or-7 thou smaller than the bushing, depending on the size of the neck before sizing, the thickness of the neck wall, and the state of the anneal (the hardness of the neck). You will NEVER run neck into a bushing and get a finished neck the same size...

fdshuster said:
I've checked all my Redding & Wilson neck bushings simply by measuring the case O.D. after sizing, using a micrometer. Yes, there are some slight differences, the most I've ever seen is .001" (smaller or larger), the majority are .0005", not enough for me to be concerned. Some are exactly as stamped.

I've made notes of the "advertised" diameters and the actual sized diameters.

Measuring the finished neck does not tell you the size of the bushing.
 
It's the best indication I have, works for me, ( always producing proper neck tension), and I will continue to use this method. Don't agree? Then don't measure the sized neck diameter with a micrometer.

Six or seven thousandths smaller? So a .336" bushing can produce a sized neck diameter of .329"? How can a case neck be made to .329" diameter by a .336" bushing?

I can understand a few ten thousandths larger due to springback, hardness, etc., but not smaller.

And if there is that amount of inaccuracy between the bushing diameter and the sized case neck, then why would anyone have a custom sizing die made that would include a fixed case neck diameter?
 
Simple answer...to really know what teh ID is, use a plug gauge. The rest of the issue mentioned in the above discussion is a matter of componants. The OP asked about the ID of the bushing. Is it or is it not the size advertised? Use a plug gauge.

Snert
 
fdshuster said:
It's the best indication I have, works for me, ( always producing proper neck tension), and I will continue to use this method. Don't agree? Then don't measure the sized neck diameter with a micrometer.

Six or seven thousandths smaller? So a .336" bushing can produce a sized neck diameter of .329"? How can a case neck be made to .329" diameter by a .336" bushing?

I can understand a few ten thousandths larger due to springback, hardness, etc., but not smaller.

And if there is that amount of inaccuracy between the bushing diameter and the sized case neck, then why would anyone have a custom sizing die made that would include a fixed case neck diameter?

I brought this problem up with Pat Ryan at Redding about 15 years ago... if the fired neck is much larger than the bushing, then neck will overshoot the mouth of the bushing - it is not a theory, it is a fact.

Fired cases from my 300 WM 1,000 yd rifle were so much smaller the first time I sized them that I took the bushing out of the die and put it on the sized neck - it rattled!! I replaced that bushing with one that was two thou larger than the loaded neck size, then then the sized necks were two thou under - where I wanted them to be.

The problem has to do with the way the bushings are made - it is fixable (with work). I have now modified all of my bushings.

Be my guest and call Redding if you don't believe me.
 
To the OP, I have a gage lab as part of my machine shop. If you want to know for sure send it to me and I'll let it stabilize temp for 24 hours and then measure it on the coordinate measuring machine and send it back to you. I can tell you diameter and cylindricity, along with perpendicularity to the faces.

FWIW all of mine I've checked have either been on size or under by one or two tenths. Too many factors to just say the bushing is too small. Has to be temp stable and measured with something capable.
 
Thanks for all the info guys!! I just didn't realize that my caliper would not measure close enough to give me an accurate reading. I "Have" measured one or two that were only about .001 off so that is why I was concerned.
 

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