6br neck bushing

[mikeincool]

I picked up a rem 700 trued action with a Shilen 6mm br 20" barrel. I was told that it was a no neck turn chamber. My question is how do I determine which bushing to use in my redding bushing die. I bought with a 264 and 266 bushing. The guy that sold the gun also built it 20 years back. He said to use a 269 or 270. Can I measure the case once I have fired it? Any thoughts would be helpful.

 

[Judd]

Seat a bullet and measure the neck and subract one thousandth is a good place to start.

Working with what you have a .266 will work...seems I normally end up with the rifle liking .266 or .267 on a no neck turn 6br case.

 

[ShootDots]

I have had a 6mmBR and now 2 6mm Dashers.. A "no turn neck" has been a .272 for the longest time. Since I do turn my necks, I always use bushing dies. My 6mmBR was a "no turn" .272 neck, BUT even "turning my necks just to CLEAN them up" a .266 gave me 1.5K neck tension with about 4K clearance... It was EXTREMELY accurate.. If you have a .266 and a .267 bushing, you will cover ALL your bases UNLESS you turn MORE than 1 FULL thousandths off your neck>> if you do that you may find you will need a .265... A .266 is a good place to start. If you DO NOT turn necks whatsoever, the .267 will be ideal..

 

[snakepit]

I shoot a no turn 6BR. The neck of a fired round measures .270, a loaded round .268 and I use a .266 or .267 neck bushing with about the same results. Lately I have used the .266 bushing followed up with a expander mandrel which gives me .2665 just to try something different.

 

[ShootDots]

I shoot a no turn 6BR. The neck of a fired round measures .270, a loaded round .268 and I use a .266 or .267 neck bushing with about the same results. Lately I have used the .266 bushing followed up with a expander mandrel which gives me .2665 just to try something different.

Hey Snake, Forster will hone out a F/L die to .2665 if you want. I had a 6-6.5 x 47 and had 2 made, 1 at .267 and 1 at .2675>>> the latter was for 115 Bergers and the other for 115 DTAC's.. I did not think they could or would do it to the 1/2 thousandths BUT they did!!

 

[snakepit]

Hey Snake, Forster will hone out a F/L die to .2665 if you want. I had a 6-6.5 x 47 and had 2 made, 1 at .267 and 1 at .2675>>> the latter was for 115 Bergers and the other for 115 DTAC's.. I did not think they could or would do it to the 1/2 thousandths BUT they did!!

ShootDots, thanks for the information and I will check into that. I had been using a Redding F/L bushing die and just bought a Harrells F/L bushing die for which I had to send in 3 fired cases to order one.

 

[mikeincool]

Thanks for the information. How much neck tension do I want? Does that effect accuracy? I have loaded 50 rounds with the 266 bushing in my redding resized die. I used hornady 65 v-max and noslar 70 ballistic tips. I could feel more resistance when setting the bullets on one type. I also have 100 Norma brass and 100 lapua, is there a difference in neck thickness?

 

[ShootDots]

I prefer 1K "or thereabouts" for neck tension. If you get over 1.5K your accuracy MAY (every gun is different) suffer to some degree. My BEST accuracy has almost always been right at 1K neck tension.. Your bullets should slide into the case like smooth butter. If they do not and you have varying degrees of pressure to see bullet, you PROBABLY need to anneal your brass.

I have never fired Norma 6mmBR brass so I can not comment on it..

 

[brxbrad]

These are the instructions I've followed since day one.
http://www.forsterproducts.com/client_images/catalog19938/pages/files/Bushing_Bump_Neck_Sizing_Die_DIE-0008.pdf
You can tweek as needed.......

 

[artbosco]

I picked up a rem 700 trued action with a Shilen 6mm br 20" barrel. I was told that it was a no neck turn chamber. My question is how do I determine which bushing to use in my redding bushing die. I bought with a 264 and 266 bushing. The guy that sold the gun also built it 20 years back. He said to use a 269 or 270. Can I measure the case once I have fired it? Any thoughts would be helpful.

The FIRST thing you've got to do is to determine what size neck the reamer cut the neck chamber to. Without that dimension you're just guessing, and that you don't want to do.

Reloading properly is not based on guesses. Go get that dimension.

 

[snakepit]

My BEST accuracy has almost always been right at 1K neck tension.. Your bullets should slide into the case like smooth butter.

Last week I was loading some 6BR 105 Hybrid to .001 neck tension. The brass had been fired 6 times and this was the second time since they had been annealed and like you said the bullets seated like smooth butter. I then decided to load 10 new pieces of brass. I prep them like I always do new brass but when I went to seat the bullets I was surprised at the force it took to seat them to .001. I ended up seating 5 rounds and it never got any easier. Then I realized that I had not lubed the inside of the necks of the new brass. I then decided to load the other 5 new cases but this time I lubed the inside of the necks and the bullets seated very smoothly. I wanted to see the difference in grouping between these two groups of new brass so I fired them when I went to the range the next day. At 600 yds the 5 new brass rounds with no inside neck lube measured about 3" wide and 1" tall and the 5 new brass rounds with lube measured about 1 3/4 wide and 1" tall. Another day another lesson learned.

 

[Longone1]

I just picked up a Type "S" die and was would like to know if you use the larger or smaller button supplied with the die?

Longone

 

[jonbearman]

We tend to use the small one which only holds the decapping pin into the die.There are others who use the expander. I don't and rely on the bushing to size the neck to whatever I need it to be. I hope someone chimes in on why they use an expander.

 

[Longone1]

I really hope I'm not hi-jacking this thread and if someone feels so please have a mod move it or tell me to start a new thread. I do feel it's connected.

The last batch of 6BR I loaded there seemed to be a "donut" feel at the shoulder neck junction and I can't imagine why it felt that way when seating a bullet, that is why I ask the question. I am leaving a little play when setting up the die bushing so I'm not sizing the neck to the shoulder. But a definite increase in seating pressure was required.

Longone

 

[artbosco]

If the neck chamber was reamed to .272" and you allowed .001" clearance on each side, for a loaded round OD of .270".

Then start with a .269" bushing for .001" tension and work down, for example .268" for .002", .267" for .003", .266" for .004" neck tension, etcetera. .001" through .004" is usually the normal range.