New 6br .268 neck chamber= no turn?

[joshb]

i just got my first 6br set up. Remmy action, kreiger barrel. The barrel has .268 nk on it. Sold to me as a no turn. I thought no turns were .272, so I loaded a dummy, it measured .268, and it chambers just fine, using new blue box lapua and Hornady 105 A max. This is my first step into the Custom realm, so please pardon the dumbness of my queery. Is this OK, or will I have to turn, for a little clearance. I plan on using whidden bushing dies and just ordered a .267 and .266 bushing. Thanks for info, Josh.

 

[tmwinds]

Measure the neck diameter of the dummy round. You would want the neck diameter of the dummy round about .002 less than your chamber neck. I would also verify the chamber neck size. A .268 neck is not a no turn neck with any of the Lapua blue box that I've seen. I turn my necks to .012 for a .269 neck.

 

[BradY]

No, with a 268 loaded round in a 268 neck chamber your going to have pressure problems as there is nowhere for the neck to expand when the bullet is fired.

You will have to turn the necks down so loaded rounds are more like 265. Would be a little peeved if it was sold as a no turn neck gun.

 

[KMart]

When I ordered my 6BR reamer, I spoke to Dave Kiff and he speced out the neck at .2704 for a no turn using the blue box lapua brass.

 

[areaone]

Same as my spec...2704

 

[dbramley]

My unturned blue box loaded round measured .270 I bought .272 for no turn neck gun.

I shoot .0015 clearance in my other dasher

 

[boltfluter]

Josh,

Definitely not a dumb question. May have saved yourself a lot of grief.

Regards, Paul

www.boltfluting.com

 

[comagutsa]

yeah i'd be checking that.. blue box lapua loaded round with 105gr beger measures .269 in my no turn neck .272 6BR

 

[joshb]

No, with a 268 loaded round in a 268 neck chamber your going to have pressure problems as there is nowhere for the neck to expand when the bullet is fired.

You will have to turn the necks down so loaded rounds are more like 265. Would be a little peeved if it was sold as a no turn neck gun.

Yeah, That was my initial reaction. I spent most of last night doing research and being angry. Some anger at myself for jumping on the deal with out more research. This morning is better, as I got it out of my system. The bottom line is simple. I got a Kreiger barrel, chambered and fitted to an action with a very low round count, for $300. From what I've seen on this site, that's a pretty good deal. So now I have to deal with it. Getting all the tools to do turning will cost X dollars. Sending the barrel off to a Smith, to get reamed to no turn, will cost Y dollars. If I send it off, am I just avoiding the inevitable and taking the easy way out? Or, am I reading about competitors going to no tun, and being smart? I'm only 58,and I think I have alot of miles left in me. What are the opinions of the "more seasoned shooters" here?
Josh.


PS: I have to say, from reading thru the archives, that a lot of guys have been in the same spot as I am right now.

 

[Preacher]

I would buy the tools and turn them down, it's easy enough to do...

 

[joshb]

Thanks, Preacher. I am good with tools. I guess the next question is which tools? I read PMA is good. Thoughts, anyone?

 

[dbramley]

I would recommend a pumpkin from Bruno's, pricey but an excellent tool. Get a mini lathe from harbor freight and you will be making excellent brass quickly. See Erik Cortina's video on turning necks in a lathe, makes the job a pleasure.

 

[dreever]

call PMA they can set up a model B for you which would be the cheapest route.

Danny

 

[harv50]

Why not do a chamber cast and then there would be no question what you have.

 

[dbramley]

Could always spin the barrel off and use pin gauges. It has been my my experience with chamber reamers and neck reamers that the diameter can be off as much as .003 from the print. It would be a good idea to measure the actual neck.

 

[joshb]

Well, as per advice, I remeasured my dummy round and found it from .268 to .270, as I move around and around the neck. The chamber cast may be the best route to find out exactly what I have. Oh, the learning curve is getting steep! On the neck turner, I think I'd get the better tools, "for the future", but maybe not a lathe. The wifey would get real grumpy, after what I already dished out. Please keep the opinions coming.

 

[lrgoodger]

I have a 6BR reamer I specified with a .268 neck. I have had five barrels chambered with it. An un-turned Lapua load would chamber in them - just barely. The other guys are right, it is not enough clearance. I had the reamer made that way so I could do a clean up turn on the Lapua cases to get the necks uniform. The no turn Lapua are very accurate but I wanted to erase that last bit of doubt and get them as perfect as possible.

There is a slight possibility that your neck might be big enough because of a sloppy chamber job, but I wouldn't count on it. The good thing about turning necks is you only have to do it once. I don't agree with those who say turn it just enough to knock off the high spots. I tried that and in EVERY instance the bullet tipped in the direction of the untouched side of the neck, causing more bullet runout than I wanted. Turning just enough to get a clean cut on all sides of the neck eliminated that issue.