Which Sinclair mandrel to fix case mouth dents?

[NoahbodyImportant]

I have case mouths that have slight dents in them.

Sinclair has 2 types: oversized expander mandrel and neck turning mandrel.

I am not neck turning, just want to fix the dents so I can seat the bullet.

Thanks

 

[jbpmidas]

Use the oversize expander. The neck turning mandrel is for, well, turning necks.

 

[Shynloco]

Use the oversize expander. The neck turning mandrel is for, well, turning necks.

There you have it!

 

[amlevin]

I have case mouths that have slight dents in them.

If you have only a few, try what I used to do. Just put them in the trimmer and push the pilot into the neck. Unless the neck is severely dented of deformed, and it's just a case of making the case mouth not being round, this works great without having to buy any extra tools.

That said, I use a Sinclair O/S Expander as part of my case prep for uniform neck tension.

 

[jlow]

Use the oversize expander. The neck turning mandrel is for, well, turning necks.

This is technically correct, but I would like to ask a theoretical question - why not use the turning mandrel?

Is the neck already enlarged too much from firing to be properly cleaned up by the turning mandrel? If not, it should still take the dents out but enlarge the necks to a lesser degree and work the brass less before resizing?

 

[Turbulent Turtle]

I use the neck turning mandrel to fix dents in virgin brass; using an oversized mandrel is counterproductive for this application, IMO.

If the dents are in fired brass, the sizing die should take care of that; I try to avoid walking on my fired brass, but your situation may be different.

 

[amlevin]

Use the oversize expander. The neck turning mandrel is for, well, turning necks.

This is technically correct, but I would like to ask a theoretical question - why not use the turning mandrel?

Is the neck already enlarged too much from firing to be properly cleaned up by the turning mandrel? If not, it should still take the dents out but enlarge the necks to a lesser degree and work the brass less before resizing?

The OP just wants to straighten the case mouth enough to seat a bullet. for that, just about anything might work including the proper sized Phillips head Screwdriver shaft. 8)

 

[jlow]

Use the oversize expander. The neck turning mandrel is for, well, turning necks.

This is technically correct, but I would like to ask a theoretical question - why not use the turning mandrel?

Is the neck already enlarged too much from firing to be properly cleaned up by the turning mandrel? If not, it should still take the dents out but enlarge the necks to a lesser degree and work the brass less before resizing?

The OP just wants to straighten the case mouth enough to seat a bullet. for that, just about anything might work including the proper sized Phillips head Screwdriver shaft. 8)

I think he did ask which Sinclair mandrel....

 

[NoahbodyImportant]

The dents I would like to fix are those from hitting the brass deflector on the AR15 (which I fixed by putting a piece of soft rubber on the flat side) and once fired brass from the M1 Garand.

I will post pictures later.

Thank you for the replies.

 

[NoahbodyImportant]

Here is a crappy picture of what I like to fix before sizing, seating, trimming....

I can not even fit it over the pilot on the inside flash hole deburr tool.

Oversized or Neck turning mandrel?

http://alliancerifleclub.us/documents/Jeff/dents.jpg

http://alliancerifleclub.us/documents/Jeff/dentsz.jpg

 

[Turbulent Turtle]

I would just resize the brass as is; why go through two operations?