Bullet central micron neck bushings or sac neck bushings.

[muffo]

I recently bought benchrite carbide neck bushings. And they aren't even close to the right size. I sized my br brass with a .2650 bushing and the brass came out at .259.
What are people's thoughts on sac vs bullet central micron

 

[L.Sherm]

Send it back

 

[dgeesaman]

What does the bushing ID measure? A caliper should easily spot a .006” error, if it’s the bushing. My Benchrites are within .0002” of nominal so if it’s wrong, they will make it right.

 

[muffo]

What does the bushing ID measure? A caliper should easily spot a .006” error, if it’s the bushing. My Benchrites are within .0002” of nominal so if it’s wrong, they will make it right.

Ok so I just measured it and it's measuring .266 how can my cases possibly be coming out sized at .259. They measure .269 before being sized. They are shrinking 10 thou using a what's ment to be a .2650 bushing that measures .266(measured with mitutoyo calipers)

 

[wvlongshot]

You mentioned br brass. By chance are you using a 22 br die for 6mm? The neck may not have enough clearance underneath the bushing.

 

[WIB3]

Break out the gauge pins and verify. They don’t lie. They are relatively inexpensive and just about every BR shooter has a set.

 

[L.Sherm]

You mentioned br brass. By chance are you using a 22 br die for 6mm? The neck may not have enough clearance underneath the bushing.

I had this happen on a 28 Nosler die for my 30-28 Nosler

 

[jepp2]

Ok so I just measured it and it's measuring .266 how can my cases possibly be coming out sized at .259.

On some brass, the necks will come out significantly smaller in OD than the ID of the bushing. When I encounter this, I take the necks down in two steps. Then they come out the correct OD for the 2'nd bushing I am using. I've also had it happen with a FL sizing die with the expander removed.

https://www.redding-reloading.com/tech-line-a-tips-faqs/140-bushing-selection

As described by Redding (but I have seen it with much less neck reduction): "It has come to our attention through customer calls and our own use of the bushing style sizing dies that in certain instances, a given neck sizing bushing will produce a case neck diameter that can be several thousandths of an inch smaller than the actual diameter of the bushing. This idiosyncrasy occurs when the neck diameter of the fired case is a great deal larger than the diameter of the neck sizing bushing, such as occurs when factory chambers are on the large side of the tolerance range and the brass is on the thin side. Typically, we have not noticed any problems until the case neck is reduced more than 0.008-0.010"."

 

[muffo]

Unfort

Break out the gauge pins and verify. They don’t lie. They are relatively inexpensive and just about every BR shooter has a set.

Unfortunately I'm away from home studying at uni so I'm reloading with just the basics. Normally I could at least run an expander through the cases to initially fix the problem. Instead I'm flying out to a match in the morning with ammo that is most likely going to shoot terrible.

 

[muffo]

I had this happen on a 28 Nosler die for my 30-28 Nosler

No. It's a 6br bullet central micron die. It's the first time I've used this neck bushing but not the die. I just changed lots of brass with this chamber. My old brass was a lot thinner and I had to use a smaller bushing. I changed from .263 to .2650 bushing. I had no issues previously with the die.