Any Ideas ?

[Butte Sink]

Hello All,

I'm wondering if any of you may have an idea how to expand a neck to allow for free bullet travel?
I'm in the process of making a new .284 case , 7mm Rem Mag for a OAL cage.
Case is fire form, not resized and the case will not accept the bullet.
The only mandrels I have are .283 and a .307 so that's not going to work.
Form grim, I tried seating a bullet and then pulling it, no luck there

Kind of stumped

Any Ideas?

Thanks

 

[wedgy]

Use a drill bit , round file, or dremel on the inside neck. You can take a smaller drill bit on a drill and press it on the inside neck and it will remove material, not pretty but it works.
If you fired this case and it won't take a bullet you may need to anneal because there is too much spring back or turn the neck because there isn't enough chamber clearance.

 

[Butte Sink]

Thanks

Funny you say that.
I deprimed all the case, tumbled cleaned and annealed.
Stumped on this one never had an issue prior

These are cases I've never used before , ADG
I've always used Nosler prior

 

[nmkid]

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

Maybe these would help.

 

[Sniper338]

A small file would give best control to get it where you want it.

 

[GLShooter]

I just used a dremel grinder bit and went in and ground the inside of the neck for a slip fit.

Greg

 

[Butte Sink]

A small file would give best control to get it where you want it.

TADA!!
Circular file!! Which I have
Thanks

 

[Rsadams]

Some brass is thicker in the necks... Could that be your problem..????

 

[Bill Norris]

Emory cloth wrapped arpund a small wood dowel worked well for me.

 

[Butte Sink]

Some brass is thicker in the necks... Could that be your problem..????

not sure strange
50 rounds all the same
Wondering if the cleaning / annealing had anything with the spring back

light file worked good!

 

[butchlambert]

You need measuring tools to find the real reason. I wouldn't use a file or anything on my brass. After finding the "true reason" for your problem, either inside ream or turn the OD.

 

[Brians356]

You need measuring tools to find the real reason. I wouldn't use a file or anything on my brass. After finding the "true reason" for your problem, either inside ream or turn the OD.

Thanks. I thought I was having a bad dream. Amazing sometimes what can creep out of the woodwork.
-

 

[pirate ammo]

He's just making a modified case for a length to lands gauge. Nothing major.

 

[MN50Shooter]

I used Gauge Pins to open a Fired 50 BMG Case to use as my modified case. I used a .512" pin which gave me a perfect slip fit for measuring.

 

[ronemus]

You need measuring tools to find the real reason. I wouldn't use a file or anything on my brass. After finding the "true reason" for your problem, either inside ream or turn the OD.

To amplify, several of the condiions that would cause a fired case not to accept a bullet are DANGEROUS! You could end up with a kaboom and injuries. In a factory chamber there is such generous clearance that this should never happen. If you're using a tight-neck or no-turn chamber, you need to learn how to manage clearances before you fire another round.

 

[Chasin Beaver]

He's just making a modified case for a length to lands gauge. Nothing major.

haha. What I was thinking. Don’t make it more of a job than you need to. I used some emery paper around a rod also, and had satisfactory results.

 

[divingin]

Simplest is to cut vertically down the wall of the neck on both sides. Clean up the cuts as required, then bend in or out as required.