Wich bore size to choose on a 6mmBR barrel?

[LRCampos]

I am building a 6mmBR F-Class rifle in US. So, now is the time to choose the barrel.
I already made my mind on Krieger. But I noted that there are tow bore sizes: .2360 and .2370.

I really have no idea which one to choose...
I read here that Lapua 6mm bullets may be a little undersized, so a tight bore would be better. I really plan to use Lapua 105gr. and Sierra 108gr. mostly.

Could you, please, help me decide on which bore size would be better and why?

Thank you very much!

 

[steveyrock]

I have a Broughton with a .2370 that shoots the 105 Senars very well but it shoots the Seirra 107's just as good at a slower velocity.The chamber is a 6x47 Lapua.

 

[EdwinD]

LRCampos,

.237 is less destructive to some bullets.

Edwin D.

 

[jb1000br]

No reason NOT to go .237 IMO. The only bullet that is undersize is the 105 Scenar - it runs about .2428...Lapua makes them skinny because they HAVE TO...due to certain CIP regulations,like our SAAMI)

HTH,
JB

 

[LRCampos]

Well, it looks like .2370 is the most common bore size...

What is more probable: the 105gr. Lapua Scenar to be accurate or not on a .2370 bore size?

 

[EdwinD]

LRcampos,

my best luck has been with 105 Bergers, and 107 Sierras depending on caliber.

ALSO, 95 BIBS shoot "lights out" in 10 twist.

Edwin D.

 

[steveyrock]

hey Edwin,I tried to respond to your e-mail but it comes back as undeliverable, twice. Do you have another address?

 

[EdwinD]

Steveyrock,

got your e-mail this a.m.

thank you,

Edwin D.

 

[alf]

Edwin, curious also, if you were the one asking about my Hart 6mm blank dimensions & received my e-mail response. All kinds of things came up when sent it. Hope you didn't think I was ignoring you. Al.

 

[EdwinD]

Alan,

Yes I was asking about your Hart.

Who knows what is going on with e-mail??

Try private message or e-mail again.

thanks,

Edwin D.

 

[LRCampos]

I saw at the 6mmBR Daily Bulletin today an article saying the .236 bore size would be much better for the Lapua Scenars bullets.

But what effect this same bore size,.236) would have on Berger and Sierra bullets? Would it shoot with the same accuracy? Would it cooper foul a lot more? The pressure and velocity would be the same or higher?