Hello and Questions about 6br throat.

[Riflman]

Hi everyone. First post on the board. One of the first members,can't remeber who) told me to check this out....

Anyway, just had a 6BR built. It's not for competition, it's for calling coyotes. It's a Trued Model 7 with Lilja 1:9 twist barrel finished at 27 inches and a vais brake on the end of that. Here it is before I duracoated it white yesterday.



It was supposed to be built for Lapua brass, no turn necks, and throated so I could shoot both 55's up to 107's. I knew it would be a compromise effort, but this is a compromise rifle. I want to try shooting both, and have several hundred each of moly coated 55's and 107 SMK's. Here's the problem: While I understood from the smith that the reamer was a 6BR norma spec reamer of rno turn necks and a slightly longer throat for longer necked brass and to shoot longer bullets than a standard chamber, I've now been informed that the the reamer was a 6MM BR Remington MATCH chamber, with a .271 neck and .117 throat. I am concerned that with .269 Lapua loaded brass it will be too tight and that I won't be able to shoot 55's, which will probably be what I shoot most. Most of you talk .060-.080 throats for 75-107's and .100 or so throats for dedicated 107 rigs. I see one mention of .113 as a really LONG throat for a seriously dedicated 1k 107 rig). Am I screwed here or what??

Thanks, Riflman.

 

[LeoAhearn]

The long throat will not make the rifle dangerous with 55s, just might effect accuracy.

Measure a dummy round,meaning actual bullet and brass you intend to use) before shooting. If there is not enough neck clearance, then you'll need to neck turn your brass, pure and simple, before firing.

 

[jb1000br]

Sheldon...THAT WAS ME

finally getting around to pllaying with your BR is see.

since it is a REM chamber instead of NORMA, you will probably need a small base die to get lapua brass into your chamber.

some are doing no-turn chambers with .271, but i prefer .272

definately sounds like a 107 freebore

it is exactly opposite of the chamber you were promised. I'd be having a convo with the smith/seller, and get it fixed.

your best bet might be having the chamber set back 1 thread and get the chamber you WANT.

YMMV,
JB