6BR Rem, how to get it correct?

[Dave King]

I recently picked up my latest rifle, a switch barrel rig with two 6BR Rem barrels and one 308 Win barrel. The 6BR Rem chambers are .262 neck and the barrels are one each slow and fast twist (14 and 8).

I haven't messed with any BR stuff so these two 6BR Rem things are new to me.

I have been told by the smith to use 7BR Rem brass, turn necks and them make the 6BR Rem brass that I need. I can see that by turning the necks on the 7BR Rem brass and then running them into the 6BR Rem die I push the neck turning edge up onto the shoulder and then have no donut. I turn the necks (I've been playing) so that I end up with a .260 and .262 diameter with a loaded bullet...I believe I should be about .261 but its a little difficult to control the process to that level for me).

I'm using a 68gr bullet at this time in the 14 twist and plan to use a 107 in the 8 twist.

Questions are:

What should be the neck diameter with a loaded bullet?

What is a good powder to start with for the 68gr bullets (I've tried 3031 and it seems okay, not great but okay)?

What powder for the 107s?

I've noticed that the cases are shorter than the stated "trim to length" (I guess because of the 7BR Rem to 6BR Rem resize) is there anything to consider with this?

Any by-the-way tips for a novice 6BR guy? I'm going to use this as a plinker, F-Class, groundhog, deer and whatever gun.

The rifle is a single shot Rem 40X with the factory wood stock and I'll be shooting it from a bipod in all cases. (I did stick a Badger base and rings on it and a spare Leupold 6.5 x 20 30mm Mark4 Gen2 mildot so I'd feel normal.)

[BLASERMAN]

You know there is a web site 6BR .com there you should find all the answers.

[Dave King]

Thanks

I've already been there and read a pile of stuff, I'm now looking for additional somewhat specific info.

[jb1000br]

Dave -- You ARE allowed to post over there BTW [img]/ubbthreads/images/graemlins/wink.gif[/img]

the link is actually http://www.6mmbr.com

First Tip...scrap the rem chamber and punch it out to a 6BR Norma...then use lapua 6BR brass.


.260" loaded round is plenty tight IMO...i like 0.003 total clearance in 1KBR

powder for the 68s = n135, benchmark

107's = varget, RL15, h4895/IMR4895, h4350 will make a nice compressed load too.

THe 6BR Rem chambers are shorter...so dont go by 6BR norma trim-to length.

HTH,
JB

[jb1000br]

BTW -- a good neckturning job will hold to +-0.0001"

[Dave King]

JB

Thanks

I know I can post there but I have about a zillion places I post and am trying to cut back a bit.

It's good to know about the 3 thousanths clearance, I thought I might be getting the necks too thin for no good reason, I believe I'll stick with the .260.

The fella I spoke with at at Sinclair suggested N140 but I'd seen N135 in several places too, I'll try the N135 first.

I want this as a play and learn gun so I'll probably leave it at the 6BR Rem chambering... plenty of little things to do to make it work and I have a lot of "easy" to use rifles.

I'd seem Varget for the 107's and have plenty of it around and I have some of the others you list too (left over from the pre-Varget days).

I wasn't sure of the trim-to-length for the 6BR Rem. If I recall correctly the Sierra book shows 1.550 (sounds like Norma 1.560 length) but my brass is at 1.520 and the brass I have from the smith's test rounds is 1.520.

On the turning and resize.. I turn the 7BR Rem brass necks to about .008 or so and it thickens on the resize/form to 6mm but the amount seems to vary a bit and I'm trying to eliminate the return once the brass is 6mm.

[jb1000br]

FYI -- you can probably find 6BR Rem brass if you post a WTB over there. It has come up several times.

Your varying thickening doesnt sound good to my ears, cause im pondering the same setup but going from 6.5-284->284...might have to move the nk first, then turn it ..in fact I will have to with the above arrangement...

Sorry, i kind of "assumed" varget...was just giving other options...varget is the most popular with heavies.

Jackie Schmidt on BR central has played extensively with 135 and the light bullets in a BR.

1.520 is the rem. number...stick with that.

JB