Which reamer, bullet and twist rate for 6br?

[DShortt]

On one hand, it seems this has been beaten to death. On the other hand, this cartridge is new to me, so I don't know what to do.

Bought a used Borden action with a 6br barrel and benchrest stock. Barrel was very fouled and looks questionable at best when cleaned. So. The doubt is already in my mind. Thinking of a rebarrel.

Want to go with a Kreiger blank. That much I do know. I'm restricted to 200 yards now and for the foreseeable future.

Given that distance restriction, what would you choose regarding the rate of twist, bullet weight and reamer selection? I've never turned necks before. Understand the process, just never done that.

I don't even know if I'm 'cut out' for benchrest. Just 'dipping my toe' in the water to see what I think about it.

Thanks for looking.

 

[60723]

1:8 or 1:7.5 twist
Bartlein, Kreiger, Brux
I would suggest Varget and 105 Hybrids
or 103 Vapor Trails
No neck turn chamber

 

[ELR LVR]

JGS offers a 6 br CIP reamer “but” I would personally stay mainstream and go for the wheeler #1 bra .272 no turn NK reamer /1-8 twist with a 103-105 class VLD
If you want to turn necks than go with Wheeler #1 .268

You can’t go wrong with either.

This, ^^^
and I say turn your necks for optimum fit, brass life, concentricity etc etc etc.
(I love when all my uniformed brass is exactly the same and sizes the same with the same neck tension)
if one is .001" off, I can tell

 

[DShortt]

So......

I'm surprised that the 103s and 105s are mentioned for 200 yards and under.

Is that a big benefit at shorter distances?

500+? Yes, I completely understand that.

 

[ELR LVR]

So......

I'm surprised that the 103s and 105s are mentioned for 200 yards and under.

Is that a big benefit at shorter distances?

500+? Yes, I completely understand that.

Good point, not needed for 200 yds
I like 80-95 gr range
---
103's and up just give you the "ability" to stretch your legs is all so most everyone simply builds on an 8 twist

 

[Schippergreg]

Short range benchrest shooters typically shoot 13.5-14 twist barrels and 65-68gr bullets for a reason. If something else would agg better, they would use it.

 

[DShortt]

Short range benchrest shooters typically shoot 13.5-14 twist barrels and 65-68gr bullets for a reason. If something else would agg better, they would use it.

Short range out to 200, or short range 100?

Might not matter, don't know. So I'm asking.

 

[DShortt]

Hard to judge 103 Vapor trails at short range, they’re just one hole.

OK. Good to know.

I've read these statements about bullets needing some distance to 'go to sleep'.

Never made a lot of sense in my mind, but there's a lot about shooting sports that doesn't seem intuitive.

 

[Idaho-Lefty]

On one hand, it seems this has been beaten to death. On the other hand, this cartridge is new to me, so I don't know what to do.

Bought a used Borden action with a 6br barrel and benchrest stock. Barrel was very fouled and looks questionable at best when cleaned. So. The doubt is already in my mind. Thinking of a rebarrel.

Want to go with a Kreiger blank. That much I do know. I'm restricted to 200 yards now and for the foreseeable future.

Given that distance restriction, what would you choose regarding the rate of twist, bullet weight and reamer selection? I've never turned necks before. Understand the process, just never done that.

I don't even know if I'm 'cut out' for benchrest. Just 'dipping my toe' in the water to see what I think about it.

Thanks for looking.

For 100 & 200 yard BR, Watch, the Top shooters ( on youTube ? ) and How their Rifles "Track", in the "Bags" they shoot very Fast to, Beat the Wind. I've watched Mike Bryant,. on YouTube,.. Wow !
Watch, Winning in the Wind ( Kieth Glascock,.. get 2" group's @ 600 yards ).
I Compete against, Yotes and Sage Rats,.. my Competition Trapshooting for, Money, Guns and Trophies,.. were, 40 Years ago !

 

[Idaho-Lefty]

Short range benchrest shooters typically shoot 13.5-14 twist barrels and 65-68gr bullets for a reason. If something else would agg better, they would use it.

THIS,.. ^^^
There ARE several guys On Here that, CAN answer, most of your Questions and you may want to, Do some Older,.. "Research".
Here's where, I got, the "Tip" to Jam, the 107 SMK's, in my 6 XC,.. to "BugHole"

 

[Schippergreg]

Short range out to 200, or short range 100?

Might not matter, don't know. So I'm asking.

100 and 200yds. There’s a great selection of custom benchrest bullets you can get also.

 

[JFrank]

OK. Good to know.

I've read these statements about bullets needing some distance to 'go to sleep'.

Never made a lot of sense in my mind, but there's a lot about shooting sports that doesn't seem intuitive.

Bullets don’t go to sleep.

“You mentioned 6br” I brought up a better version.
I’ll step out

 

[Jrjones]

What are you shooting ? Targets? I shoot varmints at 300 and in. I shoot a slow twist 6mmbr short freebore and 55-70gr bullets for varmints. Cldnt be happpier. I shit my pants the very first time I shot the 60gr sierra hp thanks to a recommendation from ackleymanll! Shit myself. Wanna keep it simple? I’m not a benchrest shooter but I’m having fun. I shoot A2230. Works on crows w authority.

 

[steve210]

13.5 twist 66- 68 gr. Custom bullets

 

[Clancy]

.272 nk .050 freebore

12 twist 4 groove

Take your pick of Bart’s 68s and 80s and use N135, Fed 205 and Lapua brass.

68s will outshoot 80s pretty handily but when the wind gets up the 80s are nice to have at 200.

 

[Bronsin]

JGS 1262 reamer, .272 neck, .045 freebore. Any 65-68gr BR bullet you choose, and a 13.5" twist barrel, 20" long and 5lbs 2 ozs.

 

[DShortt]

What are you shooting ? Targets? I shoot varmints at 300 and in. I shoot a slow twist 6mmbr short freebore and 55-70gr bullets for varmints. Cldnt be happpier. I shit my pants the very first time I shot the 60gr sierra hp thanks to a recommendation from ackleymanll! Shit myself. Wanna keep it simple? I’m not a benchrest shooter but I’m having fun. I shoot A2230. Works on crows w authority.

Yes, just paper.

I do not have access to any hunting property apart from public land owned by my home state.

Nothing going on there I'm interested in engaging in so, just paper targets at the gun club.

 

[DShortt]

Bullets don’t go to sleep.

“You mentioned 6br” I brought up a better version.
I’ll step out

Not sure what you mean by a 'better version'?

And I meant no offense.

Again, completely new cartridge to me, I'm operating under access restrictions I don't see changing soon, so I'm asking questions and trying to figure out what matters to my circumstances.

I do not wish to spend months trying to 'reinvent the wheel'. Which is why I'm asking questions.

Site was originally called '6mmBR, if I understand correctly. Seems like the best place to ask questions.

 

[ELR LVR]

OK. Good to know.

I've read these statements about bullets needing some distance to 'go to sleep'.

Never made a lot of sense in my mind, but there's a lot about shooting sports that doesn't seem intuitive.

Nutating and Nodding
Supposedly it can dampen itself out after a distance
it's a weird thing I have read about too
---
I havent looked into it further since I have never experienced it
even with VLD's
But think of seeing a football spiral perfectly, then suddenly look like its out of balance again, then go back to spiraling perfectly, I think it is more of an "on the edge of stability thing."
Some of us use a twsit rate that has a bullet right on the edge of good stability
, or rather, no more twist than is absolutely necessary, which is where I believe this phenomenon happens
But again, I havent witnessed it myself even with a SG factor of 1.4
Not saying it doesnt happen, maybe more so with heavy ass projectiles? like 338 or 50 BMG?
Since it would take from 300-600 yds for something that heavy to dampen itself out
or
---
When the center of gravity does not match perfectly with the center of form
Due to air pocket or variation in jacket thickness (one reason why solids are good)
so when leaving the barrel it has to gyroscopically re-orient it's center of gravity to the center of flight path if it is off center from center of bore line, which of course takes time and distance
this would look like spiraling in a corkscrew pattern until it dampens out.
I dont believe it causes much spread, maybe 1/4 inch, which is why sometimes a gun may shoot 1/2 MOA at 100 yds but shoot even tighter at 500 yds
---
I have witnessed something like this at Extreme Long Range past 1000 yds, the gun seeming to shoot better past 1000 yds, so within 1000 yds the bullet finds its center of gravity better, or dampens out and
"goes to sleep"
This has led me to incorrectly believe I shoot better or its easier to shoot at 1500 yds
than at 600, when in fact I think it is more the going to sleep thing happening.
---
I cannot believe a bullet can hold 1/4MOA out to 2200 yds, when I have seen it
SO I have to believe it is going to sleep on its way out to 2200 yds for it to seem to hold 1/4 MOA
so its like, it shoots worse at 600, but then goes to sleep so to speak, and shoots better at 2200, when in fact it has dampened down and tightens up over distance. (the corkscrew goes away)
but since it is tightening up as the distance increases
, it merely seems to hold 1/4 MOA

 

[DShortt]

Nutating and Nodding
Supposedly it can dampen itself out after a distance
it's a weird thing I have read about too
---
I havent looked into it further since I have never experienced it
even with VLD's
But think of seeing a football spiral perfectly, then suddenly look like its out of balance again, then go back to spiraling perfectly, I think it is more of an "on the edge of stability thing."
Some of us use a twsit rate that has a bullet right on the edge of good stability
, or rather, no more twist than is absolutely necessary, which is where I believe this phenomenon happens
But again, I havent witnessed it myself even with a SG factor of 1.4
Not saying it doesnt happen, maybe more so with heavy ass projectiles? like 338 or 50 BMG?
Since it would take from 300-600 yds for something that heavy to dampen itself out
or
---
When the center of gravity does not match perfectly with the center of form
Due to air pocket or variation in jacket thickness (one reason why solids are good)
so when leaving the barrel it has to gyroscopically re-orient it's center of gravity to the center of flight path if it is off center from center of bore line, which of course takes time and distance
this would look like spiraling in a corkscrew pattern until it dampens out.
I dont believe it causes much spread, maybe 1/4 inch, which is why sometimes a gun may shoot 1/2 MOA at 100 yds but shoot even tighter at 500 yds
---
I have witnessed something like this at Extreme Long Range past 1000 yds, the gun seeming to shoot better past 1000 yds, so within 1000 yds the bullet finds its center of gravity better, or dampens out and
"goes to sleep"
This has led me to incorrectly believe I shoot better or its easier to shoot at 1500 yds
than at 600, when in fact I think it is more the going to sleep thing happening.
---
I cannot believe a bullet can hold 1/4MOA out to 2200 yds, when I have seen it
SO I have to believe it is going to sleep on its way out to 2200 yds for it to seem to hold 1/4 MOA
so its like, it shoots worse at 600, but then goes to sleep so to speak, and shoots better at 2200, when in fact it has dampened down and tightens up over distance. (the corkscrew goes away)
but since it is tightening up as the distance increases
, it merely seems to hold 1/4 MOA

Yes. This is the type of material I've encountered.

I don't know if there's anything to it because I've not experienced it.

But it's interesting to think about, at the least.

Seemed to offend some. I've no idea why.