Brass prep

[Multiracer]

Does anyone ream the neck ID to be sure its round ?

 

[243Lapua]

I use an expanding mandrel then skim the outer.

 

[Bill Norris]

Expand with mandrel and skim turn.

 

[Multiracer]

But I am asking about the ID ? The inside diameter.

 

[Link]

If the ID is out of round and you run a mandrel in, it will shove the out of round to the OD then you can skim it down with the neck turn.

 

[47WillysGuy]

Does anyone ream the neck ID to be sure its round ?

None of the shooters I know. Most use a mandrel, a lot easier and faster.

 

[JFrank]

Does anyone ream the neck ID to be sure it’s round ?

I’m a No

 

[ELR LVR]

I do only on one of my Wildcat cases
Because when I form the body down, it's pretty thick where I form the new neck
so reaming the inside starts me off with a good smooth round surface for the inside pilot to go
then I size down after inside reaming
and then turn the outside
it also helps ensure there is no inside donut when I form the neck with the thicker area of the brass
------
otherwise No, i only turn the outside on everything else
---
many cases may not have enough meat to inside ream
and also turn the outside
the problem being, you may not be able to size the neck down enough to hold a bullet if you inside ream
---
if you inside ream, you have to expand the neck so you dont take away too much neck thickness

 

[1shot]

if you inside ream, you have to expand the neck so you don't take away too much neck thickness

This is why most of us use a mandrel to push the imperfections to the outside, then skim turn. I get about 90% cleanup taking .0005 off.

 

[NF1E]

Mandrel and skim for me too. Whatta Hobby!

 

[64Rambler]

Does anyone ream the neck ID to be sure its round ?

Only if I have donuts, and only if the bulled is seated past it. Then I ream just the donut. I had Forster cut me a reamer to my specs (0.0005" under the last gauge pin that fit above the donut). Otherwise, I think reamers are a bit too rough in this application, and like the rest, I skim the outside to get consistent wall thickness.

 

[AlNyhus]

I used to inside ream the necks on the .165 shortened 308W Lapua brass I used in my HBR rifles.

It made the necks perfectly round, straightened out the taper on the inside (funnel shaped) and eliminated the ridge at the original neck/shoulder area that you could feel when seating a bullet. Elzie Scott at L.E.Wilson made neck reamers from .3060 to .3090. After the insides were done, the cases were outside turned.

The process worked very well and the accuracy picked up significantly over cases that had not had the inners done like this.

I've done some 30BR cases this way, too. Works fine with those as long as you don't get too greedy with the diameter of the cutter...just a touch up.

I use it on the 30BR cases to touch up any donuts that start to form. It's a great way to address the donuts on any case...provided you have the right reamer dimension. You can also make a bushing and use a simple chucking reamer. Tony Boyer shows this method in his excellent book.

Good shootin' -Al

 

[ricco1949]

I built a 6x47 Lapua .100 short before the 6 GT was on the scene.

Kiff talked me into using zero free bore and full length (.400+) neck. He said, 'All your freebore is in the neck'. That sounded good in theory.

The donut was the problem. I tried cutting it out with a K&M cutting/turning mandrel. That got most of it out. After fire forming I raised the bushing in FL die to above the donut but still felt it when seating.

Solved the rest of the problem by increasing neck clearance from .001 to .002 per side and kept the bushing raised above the donut area. After fire forming no more felt donut.

 

[prone.life]

I've used a neck reamer for removing donuts until I saw @Keith Glasscock’s Dealing with Donuts video. With Lapua brass I've not seen enough neck wall thickness variance to warrant reaming.

 

[dthomas]

I don't but if you're worried about it you could use the idod neck turner that cuts the inside and outside at the same time. Never seen one in person but have seen some videos of it a few years ago.

 

[Multiracer]

I don't but if you're worried about it you could use the idod neck turner that cuts the inside and outside at the same time. Never seen one in person but have seen some videos of it a few years ago.

Interesting

 

[M-61]

Does anyone ream the neck ID to be sure its round ?

Not me

 

[DDRanch]

Not me

Nore Me!

 

[quest450]

Does anyone ream the neck ID to be sure its round ?

I do, I fireform virgin Lapua brass in no turn .272" fireforming barrel, turn necks to .011" for my .268" BRA chamber using AutoDOD, I get about .0003" runout inside and out.

 

[charlie b]

I like using the Wilson reamer after the initial fireforming of the brass. After that if I notice the donut forming I'll do it again. That's been about every 10-15 reloads with the 6BR. Usually needs a trim at that point as well.