Inside Neck Reaming, 6br

[WyoWindage]

I bought a Wilson 6mm reamer many years ago. Never used it. It fits in my Wilson neck trimmer. It measures about .245". Is it used to take out doughnuts, or??
Thanks. Ron.

 

[357Mag]

Wyo -

Howdy !

Might I ask:
- Are you talking about factory-made 6BR brass ?
- What are your brass' neck ID's & neck wall thicknesses, right now ?

If your talking about things like " doughnuts ", it sounds like you have formed your own 6BR's out of some other " basic " brass ?

IMHO:
.245" strikes me as being too much ream diam ( for 6mm final ).
When things are working right..... where you do have to ream ( necking down brass ), you'd ream to a neck ID that can accept a known diameter neck turn mandrel; w/o having to expand the case necks a whole bunch to get the mandrel to fit.

If nothing else, the necks would then receive at least a rudimentary outside neck " turn", to arrive @ final neck wall thickness desired.
In most cases, the shooter will have a final neck wall thickness target , already in-mind.

You're probably also going to end-up puttin' some squeeze on the necks, in-order to provide adequate neck tension for the bullets.
Use of a .245" neck ID would just be driving you to neck sizing down those additional couple 'thou. IMHO.


With regards,
357Mag

 

[WyoWindage]

My philosophy is if it works, try something else : Just wondering what it was for. I don't think I have a problem, but have wondered about doughnuts developing, if it would work for that. The Hornady 105gr seat down to the neck shoulder junction, but I don't notice any problem when seating them, with a Wilson Arbor. I shoot a .271+ chamber and lapua brass. A .267 neck die. A .2438 FB bullet will drop in fired cases, the .245 reamer will not. The reamer fits in my Wilson trimmer. Just another gadjet, it seems. Thanks for the description. Ron.

 

[spclark]

I have one too, don't recall why I bought the thing (maybe when I had to make 6XC brass out of 22-250? Been awhile on that...) but the only time I was thankful it was there was when I 'experimented' making 6XC brass from Lapua's then-new Palma brass with the small rifle primer pocket.

THEN it came in very handy indeed! Moving that much brass in so many steps demanded reaming the neck ID close to the end of the process, the brass was so thick.

Works great though that brass! As good, maybe better than Norma's factory product & case heads are lasting longer.

 

[Outrider27]

Don't know the early history of the 6, but when the 7BR came out, it was a wildcat chambered in Rem. XP-100s and ammo was a roll your own process using either Rem. 308 BR brass (.308 Win basic case, but small rifle primer) or any other .308 Win brass (large rifle primer). The RCBS case forming die set I purchased to form 7BR came with a neck reamer, the stated use of which was removal of the fairly considerable doughnut formed during the process of moving the shoulder waaay back and necking it for 7mm bullets. The supplied inside neck reamer, when used in conjunction with the die paired with it to maintain alignment during the reaming process, produced surprisingly uniform case neck walls.