Question About 6mmBR Norma vs. Remington

[rkittine]

In looking at the case dimensions on the 6mmBR Remington and the 6MM Norma BR, the only difference I can see is the angle of the back side of the base, which would seem to not make any difference. I then read that the issue is the chamber in that the 6mmBR Remington was chambered for the 70 grain or lighter projectiles. In one article that I read, the only difference that the 6mm Norm BR has is that it is set up for the longer 70 - 105 Grain VLD projectiles.

In some articles I read that you can interchange brass and in others I read that you can not.

So if I have a 6mmBR Remington with a .271 neck and a free bore of .120. Can I shoot Lapua 6mm Norma brass in that gun?

I am having a 40X rebarreled at the Remington Custom Shop and I am getting conflicting stories.

Thanks, Bob

 

[big bad bill]

Bob,
I have both 6mmBR Remington and 6mmBR Norma barrels and chamberings. The difference is the Remington chambers are 0.050 shorter than the Norma. You must shorten the Norma brass by 0.050 to shoot in a Remington chamber. If you can, verify the dimensions from the reamer drawing or with a cast of the chamber. You can shoot 105 grain bullets in both, depending upon your freebore. With 0.0120 freebore you can shoot 105s but you may have difficulty jamming some of the lighter bullets, under 70 grains. I Prefer about 0.060 freebore with the light bullets in my 14 Twist barrels and about 0.100 freebore in 7.5 or 8 twist barrels. The shorter Remington chambers shoot just as well as the Norma.

If you have any other questions, do not hesitate to ask.

Bill Kroneberg

 

[GSPV]

Who is going to chamber a barrel for brass that hasn't been on the market in years?

If they do happen to have a real 6 BR Remington reamer laying around, they should be fired for incompetence for using it without specific instructions and a couple of "Are you really sure" verifications. And, if they are worth their salt, they have a modern, functional 6 BR reamer.

Be aware, half the stuff floating around, like Redding dies, might say 6 BR Remington, but are sized for 6 BR Norma.

If you get the rifle back and Lapua brass will chamber, you have a 6 BR Norma chamber. If not, take it down to Bob White and have him touch the chamber up with a modern 6 BR reamer.

 

[rkittine]

Thanks Greg, I have been trying to nail them down and only get, "Lapua Brass will work in the chamber we will supply." I probably should have just had it rebarreled somewhere else, but they are doing it at almost no charge because of who the rifle had been delivered to.

Bob

 

[rkittine]

The barrel will be 1:8 Twist. Greg helped me specify everything. Might need to take a ride up there.

Bob

 

[GSPV]

Thanks Greg, I have been trying to nail them down and only get, "Lapua Brass will work in the chamber we will supply." I probably should have just had it rebarreled somewhere else, but they are doing it at almost no charge because of who the rifle had been delivered to.

Bob

If iLapua brass works, it is a 6 BR Norma. Period.

 

[rkittine]

This is what also confused me. Off the Lapua Detailed Product Discription

Important Note about 6mm BR Lapua Brass:

Brass is headstamped 6MM Norma BR to meet European CIP requirements but the case dimensions are IDENTICAL to the 6mm BR Remington. This may cause confusion as some people understand the cartridge cases are different in dimensions. In fact it is the chamber dimensions, not the cartridge dimensions that changed. 6mm BR and 6mm BR Norma use the same case specifications however the difference between the two is the cartridge overall length specification with the BR Norma utilizing a longer heavier bullet.

I do see just a couple of minor differences on the diagrams included here:

http://www.ask.com/wiki/6mm_BR?o=2800&qsrc=999&ad=doubleDown&an=apn&ap=ask.com

Sorry, don't mean to be so dense.


Bob

 

[CatShooter]

Thanks Greg, I have been trying to nail them down and only get, "Lapua Brass will work in the chamber we will supply." I probably should have just had it rebarreled somewhere else, but they are doing it at almost no charge because of who the rifle had been delivered to.

Bob

If iLapua brass works, it is a 6 BR Norma. Period.

? ? ?

I have a 6mmBR Remington minimum chamber, and when the cases are trimmed, Lapua cases chambers just fine.

 

[dkhunt14]

I don't think the numbers on those drawings are right. I believe the 6BR Norma is longer from the base to end of neck then the 6 BR REM. Matt

 

[rkittine]

I have confirmed that the overall case length is identical. Base to end of neck.

Bob

 

[Ggmac]

Sorry but I have 2 boxes of 6br rem and many boxes of 6br norma Lapua . The lapua cases are longer ( gold box ) . Dave Kiffs reamer print book also shows the CHAMBER as being longer . I know I prepped the rem brass but doubt I trimmed it .050 .

 

[GSPV]

Thanks Greg, I have been trying to nail them down and only get, "Lapua Brass will work in the chamber we will supply." I probably should have just had it rebarreled somewhere else, but they are doing it at almost no charge because of who the rifle had been delivered to.

Bob

If iLapua brass works, it is a 6 BR Norma. Period.

? ? ?

I have a 6mmBR Remington minimum chamber, and when the cases are trimmed, Lapua cases chambers just fine.

Look, Cat, you are a smart guy. Don't get wrapped around the axle arguing a label.

If it's a "6 BR" and Lapua brass works, and the custom shop told Bob that it would, it is, effectively, a 6 BR Norma, no matter what is written on that reamer.

Sheesh! Get the dang thing barreled, get Lapua brass and shoot the danged thing.

 

[CatShooter]

Thanks Greg, I have been trying to nail them down and only get, "Lapua Brass will work in the chamber we will supply." I probably should have just had it rebarreled somewhere else, but they are doing it at almost no charge because of who the rifle had been delivered to.

Bob

If iLapua brass works, it is a 6 BR Norma. Period.

? ? ?

I have a 6mmBR Remington minimum chamber, and when the cases are trimmed, Lapua cases chambers just fine.

Look, Cat, you are a smart guy. Don't get wrapped around the axle arguing a label.

If it's a "6 BR" and Lapua brass works, and the custom shop told Bob that it would, it is, effectively, a 6 BR Norma, no matter what is written on that reamer.

Sheesh! Get the dang thing barreled, get Lapua brass and shoot the danged thing.

I just don't think it is that big a deal... measure the chamber length with the Sinclair length thingie, trim the brass ~20 thou shorter and shoot it - there is no need to get a new barrel because of the name stamped on the barrel...

Either case works - I have both and they're the same stuff - it is like arguing 223 vs 5.56.... same animal.

 

[expiper]

OP ,,,,the original 70's era BR (both 22 and 6mm) had 1.520 chambers (new is 1.570 or a lil longer ),,,and the base line (,200 line ) is .004 bigger with the new Norma/Lapua brass (CIP)...I had chambers from the 70's that would not accept the new era brass even when trimmed,,,too fat for the old chamber/reamer,,,,make shure that Remington has got rid of their old spec reamers,,,,,Roger

 

[rkittine]

I am hoping that is the case, but have yet to get a straight answer that makes me comfortable.

Bob

 

[rkittine]

Guess I will find out when I get it back.

Bob

 

[djporter]

Ditto what expiper said. I have 6BR Remington chambers that a Lapua brass will not chamber in even if it is trimmed. Also if you fire Remington brass in a Lapua/Norma chamber you better have a small base die because after three or so firings they will not extract. A Lapua/Norma full length sizing die will not get the base small enough.

 

[GSPV]

He doesn't *want* a 6 BR Remington.

They are telling him that it's a no turn chamber for Lapua brass. He wants to shoot Lapua brass. At that point, it doesn't matter if they call it "George".

 

[dkhunt14]

If Remington is chambering it they still would have the 6 BR REM reamer that they made their 40X in. Jim Stekyl who worked for REM invented it shot Benchrest with it. I would want to make absolute certain what reamer they used. Longer brass in a short chamber wouldn't be good. Sorry but If it was mine I would want to be absolute certain. Matt

 

[Ggmac]

+1 what Dkhunt said . 2 diff lengths of brass ,not just chamber as in 223 / 5.56
Make sure he ( smith ) didn't say 6Br Norma = 6Br Lap , they are the same.