BRA BUSHINGS BIG SURPRISE

[AGSHOOTER]

I'm finally getting time to find my load on a barrel that Alex did for me over the summer >268 NK so I am trying different sizes necks so I went with I thought it was a top brand and have a good reputation on reloading dies and equipment etc, so I ordered 3 bushings .262, .261, .260 So out of the .260 I get the same results that I get from the .261 went and measure the ID same ID as the .261, No big deal I thought everyone one makes mistakes Oh by the way I had them overnight so I don't loose the weekend. So I email them with my concern and to my surprise I was told they don't make that mistake That's when I noticed I am getting old I didn't get upset not how I used to get or maybe because I know they are not in my state So I am stock with they expensive die so I ordered .259, and .258 bushings and will see what size do I get. Its fine they could keep the $40
Curios if anyone have experience this problem I know the big companies like LEE and RCBS have had that problem but didn't expected from this one.

 

[Mark W]

I had the exact same problem when I was working up a load for my .268 neck BRA. I can’t remember right off which companies bushings were involved, but it was either Wilson or Redding.

 

[AGSHOOTER]

I had the exact same problem when I was working up a load for my .268 neck BRA. I can’t remember right off which companies bushings were involved, but it was either Wilson or Redding.

I know I heard of it from them I did my homework before I went with their die my other choice was go custom but all I heard was good thing, don't get me wrong I do like the dye not as much I like Erik's dye but he doesn't sell those bushing sizes

 

[JFrank]

I'm finally getting time to find my load on a barrel that Alex did for me over the summer >268 NK so I am trying different sizes necks so I went with I thought it was a top brand and have a good reputation on reloading dies and equipment etc, so I ordered 3 bushings .262, .261, .260 So out of the .260 I get the same results that I get from the .261 went and measure the ID same ID as the .261, No big deal I thought everyone one makes mistakes Oh by the way I had them overnight so I don't loose the weekend. So I email them with my concern and to my surprise I was told they don't make that mistake That's when I noticed I am getting old I didn't get upset not how I used to get or maybe because I know they are not in my state So I am stock with they expensive die so I ordered .259, and .258 bushings and will see what size do I get. Its fine they could keep the $40
Curios if anyone have experience this problem I know the big companies like LEE and RCBS have had that problem but didn't expected from this one.

I don’t need to measure the ID of a bushing, I size a piece of brass and measure the case mouth OD after sizing. They always seem to match the number on the bushing.

 

[dgeesaman]

I'm finally getting time to find my load on a barrel that Alex did for me over the summer >268 NK so I am trying different sizes necks so I went with I thought it was a top brand and have a good reputation on reloading dies and equipment etc, so I ordered 3 bushings .262, .261, .260 So out of the .260 I get the same results that I get from the .261 went and measure the ID same ID as the .261, No big deal I thought everyone one makes mistakes Oh by the way I had them overnight so I don't loose the weekend. So I email them with my concern and to my surprise I was told they don't make that mistake That's when I noticed I am getting old I didn't get upset not how I used to get or maybe because I know they are not in my state So I am stock with they expensive die so I ordered .259, and .258 bushings and will see what size do I get. Its fine they could keep the $40
Curios if anyone have experience this problem I know the big companies like LEE and RCBS have had that problem but didn't expected from this one.

In a word, yes. Some brands are better than others. I have found my Redding and RCBS bushings to be within .0005" of their marked nominal size. Some brands seem to be -0/+.001, others the other way. So if you mix and match bushing brands you could end up with some jumps and overlaps even if they're all in spec.

At one point I owned a set of bushings for 6mm made by a well regarded supplier and they were so far out of tolerance that one bushing was the same size as the bushing size below it. Good luck trying to work on neck tension when your bushing set doesn't change between sizes and then jumps .002".

I have a couple of Benchrite carbide bushings and those are within .0001" of marked size. I guess that's part of their higher cost and I am not letting go of them.

Anyway I have a 3pt digital bore mic if anyone is really struggling mail me your bushings and I'll measure them out to the .0001".

 

[Webster]

I'm finally getting time to find my load on a barrel that Alex did for me over the summer >268 NK so I am trying different sizes necks so I went with I thought it was a top brand and have a good reputation on reloading dies and equipment etc, so I ordered 3 bushings .262, .261, .260 So out of the .260 I get the same results that I get from the .261 went and measure the ID same ID as the .261, No big deal I thought everyone one makes mistakes Oh by the way I had them overnight so I don't loose the weekend. So I email them with my concern and to my surprise I was told they don't make that mistake That's when I noticed I am getting old I didn't get upset not how I used to get or maybe because I know they are not in my state So I am stock with they expensive die so I ordered .259, and .258 bushings and will see what size do I get. Its fine they could keep the $40
Curios if anyone have experience this problem I know the big companies like LEE and RCBS have had that problem but didn't expected from this one.

A possibily: The spring back you get is not directly related to the bushing diameter. Annealing might give diameters closer to the bushing diameter. I could see getting the same neck diameter with 2 bushing sizes. There is an assumption that a .264 and a .265 bushing would give a 1 thou difference in neck diameter. The neck diam. would only be close to the bushing diameter if there is zero springback.

 

[L.Sherm]

I do measure all my bushing I.D with guage pins because I do wanna know if there actually stamped is correct so if I wanna test different nk tension I know what to use.
I also measure the I.D of my neck after sizing with a bushing only with a guage pin so I know the exact nk tension- interference fit.
For example when I size my 30-28 ADG brass with a .333 bushing I end up with a neck 0.D of .3335 and loaded round comes out at .3385 and I.D is .303

 

[Webster]

I do measure all my bushing I.D with guage pins because I do wanna know if there actually stamped is correct so if I wanna test different nk tension I know what to use.
I also measure the I.D of my neck after sizing with a bushing only with a guage pin so I know the exact nk tension- interference fit.
For example when I size my 30-28 ADG brass with a .333 bushing I end up with a neck 0.D of .3335 and loaded round comes out at .3385 and I.D is .303

It isn't really a measure of grip on the bullet, it's just a diameter change with a lot of assumptions. No consideration of the brass properties like hardness, internal stress ect. The only good point is your doing it the same each time.

 

[rdb8847]

I would think using pin gages would be about the best tool to compare bushing ID. It’s pretty much “go” & “no go”

 

[HandgunHTR]

I do measure all my bushing I.D with guage pins because I do wanna know if there actually stamped is correct so if I wanna test different nk tension I know what to use.
I also measure the I.D of my neck after sizing with a bushing only with a guage pin so I know the exact nk tension- interference fit.
For example when I size my 30-28 ADG brass with a .333 bushing I end up with a neck 0.D of .3335 and loaded round comes out at .3385 and I.D is .303

You made a good point. Unless you are measuring the bushing with precision pin gauges, a 0.001" error is most likely due to the operator.

If you are measuring the brass and not seeing a difference, as has also been pointed out, it is most likely a brass issue, not a bushing issue.

 

[L.Sherm]

You made a good point. Unless you are measuring the bushing with precision pin gauges, a 0.001" error is most likely due to the operator.

If you are measuring the brass and not seeing a difference, as has also been pointed out, it is most likely a brass issue, not a bushing issue.

Its exactly why I check the I.D of my Necks with pin guages after sizing

 

[L.Sherm]

You made a good point. Unless you are measuring the bushing with precision pin gauges, a 0.001" error is most likely due to the operator.

I use - and+ guage pins as go - no go on bushings then ones that are .0005 difference from there to decide.

 

[L.Sherm]

It isn't really a measure of grip on the bullet, it's just a diameter change with a lot of assumptions. No consideration of the brass properties like hardness, internal stress ect. The only good point is your doing it the same each time.

I dont anneal my LR hunting rifle brass, all I can tell you is when I change the I.D of my neck size the target changes.
I also only use ADG or Lapua brass on my LR stuff

 

[Webster]

I do measure all my bushing I.D with guage pins because I do wanna know if there actually stamped is correct so if I wanna test different nk tension I know what to use.
I also measure the I.D of my neck after sizing with a bushing only with a guage pin so I know the exact nk tension- interference fit.
For example when I size my 30-28 ADG brass with a .333 bushing I end up with a neck 0.D of .3335 and loaded round comes out at .3385 and I.D is .303

Don't understand the pin guages. Just measure the neck o.d. What difference does it make how you got there. Erik Cortina does a bullet seating pressure test with a pressure guage that gives a display on the computer screen. After doing annealing and all the case prep the seating pressure still varies a large amount. Check his video.

 

[L.Sherm]

Is it the annealing, neck prep, neck interference- nk tension that's causing the searing pressure variances?
As far as pin guages measuring I.D of my neck its just what I trust more than O.D measurements.
To the annealing question or lack there of ive found it more consistent for me if I dont anneal at all on my LR stuff. I took Alex's advise on here one time when he was talking about it and said test it so I did
my personal testing told me nk prep mattered more than annealing.
I started the I.D nk measuring before I neck turned all my LR stuff so now I just keep doing it that way,, now I true up all my LR brass . If you dont nk turn were does the uneven brass go, to the inside so if you just measure the O.D.you can have .001 difference even with Lapua or ADG I have seen more than that with other run of the mill brass

 

[Webster]

Is it the annealing, neck prep, neck interference- nk tension that's causing the searing pressure variances?
As far as pin guages measuring I.D of my neck its just what I trust more than O.D measurements.
To the annealing question or lack there of ive found it more consistent for me if I dont anneal at all on my LR stuff. I took Alex's advise on here one time when he was talking about it and said test it so I did
my personal testing told me nk prep mattered more than annealing.
I started the I.D nk measuring before I neck turned all my LR stuff so now I just keep doing it that way,, now I true up all my LR brass . If you dont nk turn were does the uneven brass go, to the inside so if you just measure the O.D.you can have .001 difference even with Lapua or ADG I have seen more than that with other run of the mill brass

I have a lot of trouble believing a mandrel pushes small high locations to the neck o.d. where they can be removed by neck turning. Sounds like a theory by someone with no understanding of metal properties.

I think pin gauges are intended to be used for accurately machined holes. Case neck i.d. and o.d. are surfaces were formed by extruding thru a die. If you have a perfect i.d. of a cylinder accurate to a 0.0001” and it has a tiny bump on the surface maybe 0.002” in height would a pin gauge call it a reject based on getting hung up on that one very small area.