Expander Mandrels — Precision options?

[dbaird]

Seems I saw some place a company is making expander mandrels in different sizes in same caliber to control neck tension. Does anyone know who makes these?

 

[Dusty Stevens]

21st century

 

[jkohler]

Porter's Precision Products – P3 Machining / Gunsmithing

portersprecisionproducts.com

Uses gauge pins and works well

 

[Dusty Stevens]

^ i use the porter myself but im sure he was thinking of the 21st century. If i could go back in time id hit the easy button and go with the 21st

 

[D-4297]

YUP . 21st Century is the place , however Sinclair does offer a few in different calibers .

 

[PRECISIONWELDING01]

21st century hands down

 

[RICK SMITH]

Go with 21st. Great choice and you can get them in .0005 increments

 

[Ccrider]

May be this you were thinking of:

Expander Ball Kits - Whidden Gunworks

We also offer single Expander Balls in the most recommended size for the caliber of your choice. *Our expander ball kit is designed to work with the Whidden Gunworks decap assembly.

www.whiddengunworks.com

 

[Ranger007]

I love my 21st Century sets.

 

[RICK SMITH]

Nope 21st. Got a set

 

[swd]

Porter. Being able to use pin gages and not have to buy proprietary mandrels is great.

 

[nksmfamjp]

K&M Shooting is also doing this.

 

[FNSafari]

Seems I saw some place a company is making expander mandrels in different sizes in same caliber to control neck tension. Does anyone know who makes these?

They are for use with their neck turners.

 

[Dub]

They are for use with their neck turners.

The 21st Century ones shown above are expander mandrills. They also offer turning mandrels but those are not them

 

[nksmfamjp]

K&M:

Expand Mandrels for Bullet/Neck Tension Builder

Expand Mandrels for Bullet Tension expand the case neck so the brass will spring back to the correct size needed for seating bullets.

kmshooting.com

 

[FNSafari]

That's getting complicated . IMO, just decide to use either a full length or neck size only bushing sizer die. Measure neck thickness x 2 + bullet diameter and get a bushing to give you 4 or 5 thou downsize to a fired case. Works necks a lot less than a traditional die that sizes the neck more than needed then expands it via the button as you withdraw the case.

 

[farmerjohn]

Tag

 

[PopCharlie]

Just got a Porter Precision die, 2 collets, and 3 sets of pins. Works really well and is a no brainer to use.

PopCharlie

 

[tcmikey]

Is this process similar to using a Lee collet die? Just with more precision because of the variety of mandrels?

 

[farmerjohn]

I am changing neck dia on my short range guns as well as fooling with 2 new cartridges on my 600 IBS rifles and am currently using a Sinclair style floating die. With my current set up I can use the 21st century expanders but will need at least 12 of them for the 3 calibers. The Porter rig is about half ofthe price or less per expander but it is a ridgid set up and doesn't float. Just wondering what y'all think about ridgid vs floating... John