Neck Bushings- Bullet Central vs SAC

[foxguy]

So I recently discovered that the SAC Neck Sizing Bushings typically over size .001 thousand's. Ie, the .242 bushing sizes the neck to .243. I also checked the .261 neck sizing bushing and the neck measured .262.

Does Bullet Centrals Neck Sizing Bushings size to the stated bushing Size?

 

[WSnyder]

The actual size of the neck after sizing will generally be larger than the size of the bushing due to springback of the brass regardless of the bushing used. Now if you want to talk about consistency and or tolerance of the bushings actual size, that's different question.

 

[DLT]

So I recently discovered that the SAC Neck Sizing Bushings typically over size .001 thousand's. Ie, the .242 bushing sizes the neck to .243. I also checked the .261 neck sizing bushing and the neck measured .262.

Does Bullet Centrals Neck Sizing Bushings size to the stated bushing Size?

Ima say thats spring back. My sac and Wilson bushings do the same

 

[foxguy]

Thanks everyone. Getting to be one of the old guys, and I guess my memory is showing.

 

[memilanuk]

The two BC Micron bushings I have used thus far - 0.332 and 0.333 - both over-size the necks by 3 thou. ie the necks come out @ 0.329 and 0.330, respectively. And that's with necks that have been turned (0.013") and annealed on an AMP with the Aztec code.

Not what I was looking for, not even close.

 

[foxguy]

The two BC Micron bushings I have used thus far - 0.332 and 0.333 - both over-size the necks by 3 thou. ie the necks come out @ 0.329 and 0.330, respectively. And that's with necks that have been turned (0.013") and annealed on an AMP with the Aztec code.

Not what I was looking for, not even close.

WOW, that sounds a little excessive.

 

[Jdne5b]

The two BC Micron bushings I have used thus far - 0.332 and 0.333 - both over-size the necks by 3 thou. ie the necks come out @ 0.329 and 0.330, respectively. And that's with necks that have been turned (0.013") and annealed on an AMP with the Aztec code.

Not what I was looking for, not even close.

Did you try to measure the ID of the bushing?

 

[L.Sherm]

You can't measure bushings by how they size brass as stated above, if you really wanna know what they are use guage pins

 

[memilanuk]

Did you try to measure the ID of the bushing?

Yes. Using gauge pins, and a small hole gauge + micrometer. Bushing ID matches the number on the outside.

 

[memilanuk]

The part that melts my brain is that my *Wilson* bushings, same marked - and measured - sizes, size the necks much closer to the advertised size. Right on, to maybe 1 thou under.

Why the difference? NFC.

 

[DCC83501]

The two BC Micron bushings I have used thus far - 0.332 and 0.333 - both over-size the necks by 3 thou. ie the necks come out @ 0.329 and 0.330, respectively. And that's with necks that have been turned (0.013") and annealed on an AMP with the Aztec code.

Not what I was looking for, not even close.

I've never seen anything this far off

 

[memilanuk]

I've never seen anything this far off

Me either. Kinda put the kibosh on my plans for bushing-only sizing with those.

 

[Alan Warner]

The two BC Micron bushings I have used thus far - 0.332 and 0.333 - both over-size the necks by 3 thou. ie the necks come out @ 0.329 and 0.330, respectively. And that's with necks that have been turned (0.013") and annealed on an AMP with the Aztec code.

Not what I was looking for, not even close.

Marty
There is a lot of variables that influence results when forming alloy materials. Too many to write out here. I've learned a few things over a long, long time of hands on tool making. Give me a call and we can spend an hour or two on the phone.
Alan

 

[L.Sherm]

I've never seen anything this far off

I have with a Redding one, itscwhy I measure every one now no matter who makes it

 

[Dos XX]

The part that melts my brain is that my *Wilson* bushings, same marked - and measured - sizes, size the necks much closer to the advertised size. Right on, to maybe 1 thou under.

Why the difference? NFC.

Does one brand size the neck further down towards the shoulder? Do any of them size the neck to where there is taper?

Try flipping the SAC bushing over? I haven't seen a SAC bushing, so if this isn't possible, then disregard.

 

[memilanuk]

Does one brand size the neck further down towards the shoulder? Do any of them size the neck to where there is taper?

Not that I can tell.

Try flipping the SAC bushing over? I haven't seen a SAC bushing, so if this isn't possible, then disregard.

I don't have one either.

 

[Dos XX]

I don't have one either.

Ahh. I see you have the BC, and your necks are sized too much.

 

[Old Navy]

I have absolutely no problem measuring bushings with my veneer caliper.

 

[rwj]

You can't measure bushings by how they size brass as stated above, if you really wanna know what they are use guage pins

Caution that gauge pins only measure the smallest diameter. They can not detect ovality. As an extreme example, a .2500 pin would pass thru a 0.2501 square hole.

 

[L.Sherm]

Caution that gauge pins only measure the smallest diameter. They can not detect ovality. As an extreme example, a .2500 pin would pass thru a 0.2501 square hole.

I'm more worried about a bushing being .223 and not a .226 it was stamped that I discovered with guage pins.
Not sure a .0001 will make a difference on target in a bushing or you can measure that accurately on bushings.
My guess is theres more to worry about in your loading processes than a bushing being .0001 out.