Neck Sizing How far?

[madmanx]

Just shot 100 rounds through my 6mm Br which i loaded myself using new Lapua cases and 87 grain vmax's,i am now starting to reload using these once shot cases and will be neck sizing using my redding competition dies with .268 Titanium bush,what i need to know is how far down the neck should i size i have had several different suggestions from different people in the industry and would like to know your thoughts on the matter
Cheers Steve

 

[Cheechako]

Steve

There's no reason to size any more of the neck than necessary. That means to the base of the seated bullet at maximum. If your rifle is a single loader sizing 1/3 to 1/2 of the neck will give sufficient hold if you use the correct bushing.

Ray

 

[mikecr]

I agree with Ray. Size enough to keep the bullets from moving with your use. But no more should be needed.
I use .001" tension and size only 1/8" down the neck. I can't pull the bullets out with my fingers, and my ES is very low.

 

[tightneck]

While I agree with Ray, it doesn't appear that you do mikecr. IMHO the neck should be sized so that the pressure ring,on a flatbase) or shank/boatail junction will be supported. I think that the low ES has more to do with your consistent neck tension. I have definetely seen accuracy problems in some rifles when the base of the bullet is not supported in the case.

 

[Clarence]

Mad:
On the other hand if we just size the neck far enough to hold the bullet base and we have the semi-false neck being used as a tight spon ON the neck we run the risk of that tight spot effecting the chambered round and given a less than exact chamber could cause bad TIR especially if you jump a bullet to the Leade.
I would say that we need to size the neck as far as the bushing will provide, and if we get the doughnut them ream it out so as not to create a venturi effect or erattic gas flow.

Clarence

 

[Clarence]

mikar:
Are you shure of your neck tension? at .001 I cannot pull the bullet with my fingers, I use between .0005 and .0007 neck tension and I am unable to pull the bullet with fingers.
Also I will agree that neck tension IS the key to low ES's and SD's

Clarence

 

[Cheechako]

Hmmmm, guys. Isn't the 87 V Max a BT? No pressure ring.

Ray

 

[madmanx]

The bullet i am using is a boat tail and if i were to support the bullet as far as the base i would have to size the full neck

 

[Cheechako]

mad

I personally don't think you need to size that far down. I shoot the 87 V Max in a 244 Ackley and I only size about 1/3 of the neck. But, your mileage may vary.

Ray

 

[mikecr]

Sizing is a bad thing to do to otherwise perfect brass.
I size the least that I can get away with,anywhere).

 

[mikecr]

The moment the primer goes off that bullet's on it's own regardless of neck sizing. And with a typical factory throat,being way too large), that bullet's swingin in the wind before full rifling engagement anyway.
The neck only needs to hold the bullet straight and consistantly secured at the sweetest OAL. That's all it can do.

 

[Cheechako]

The 30 Wolf Pup seems to be winning its share of fake wood trophies. Not a whole lotta neck sizin goin on there

Ray

 

[USAPatriot]

The 30 Wolf Pup seems to be winning its share of fake wood trophies. Not a whole lotta neck sizin goin on there

Ray

I've never seen that round before. Yow. It sorta reminds me of Uncle Bill.

Interestingly I brought up the subject of doing that to,IIRC) the .223 about a year or so ago to reduce neck tension problems and people didn't seem to think too highly of the idea. It could have been the 6BR but don't think so. Comments? -Rod-

 

[tenring]

There is no reason to size below the bearing surface of any bullet. If you size down about 2/3rds, the remaining 1/3rds unsized will add support to the neck when chambered. Wilson dies are designed to size down 2/3rds, and they say they have determined this to be the ideal procedure.

 

[tightneck]

What it boils down to is that there is more than one way to skin a cat. Try different methods in your seating practices as far as tension and the amount of the neck you size, and you may find that your gun likes one way better than another. I have many different guns in different calibers and not all of them like the same amount of tension. Heck, the amount of tension may need to be changed if I change powders. I shoot mainly flatbase bullets and have always had my best results when the base of the bullet is supported but, this is just one shooters experience.

 

[Cheechako]

Rod

The Wolf Pup is the 6BR case necked to 30 with the maximum allowable case capacity. Gale McMillan's 50 FAT MAC employed the same type of neck treatment. "No neck tension" has also been played with. See my articles on the 6mmBR main site.

Ray

Ray

 

[USAPatriot]

Rod

The Wolf Pup is the 6BR case necked to 30 with the maximum allowable case capacity. Gale McMillan's 50 FAT MAC employed the same type of neck treatment. "No neck tension" has also been played with. See my articles on the 6mmBR main site.

Ray

Ray

Ray, I went and looked but came up empty, probably because I didn't know what I was looking for in the way of titles, etc. Do you have links? Thanks! -Rod-

 

[Cheechako]

try this


http://www.6mmbr.com/compcartridges.html