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B SLAGLE
09-26-2010, 05:13 PM
I am in the process of building a 30br for IBS score next year for the frist time. I am wandering if there was anyone barrel manufacturer that stands out from the rest and why? Also what is the best twist rate and grove for a 30? Thanks

skeetlee
09-26-2010, 05:46 PM
Im pretty sure i stand alone here but my next 30cal barrel will be a 17 twist brux. Matter a fact its already in the works. Krieger bartlein rock creek, shilen, broughton, they all make quality barrels. the twist should be 17 or 18. There is some really good 30BR info over on 6mmbr/ accurate shooter.com for you to read. enjoy and good luck! Lee

On another note how much neck clearance is usually needed in the 30br. can you have to much, and is .0015 to little?

Charles E
09-26-2010, 06:22 PM
I am in the process of building a 30br for IBS score next year for the frist time. I am wandering if there was any one barrel manufacturer that stands out from the rest

No.


Also what is the best twist rate and grove for a 30? Thanks

Depends on the length of the bullets you want to use.

From R.G. Robinett's web site (Edit: twist rates are for a gyroscopic stability of 1.5 I believe, which would be safe, if just a bit conservative.)


.30 cal. FB, 7 (SEVEN) Ogive:

* * *
112 Gr. (.925″ J4 1:19″ twist) BC .30

118 Gr. (1.00″ J4 -1:18″ twist) BC - .32

125Gr. (1.00″ J4 1:18″ twist) BC - .33

134 Gr. (1.080″ J4 *1:16.5″ twist) BC .35

* * *

30 cal. FB, 10 (TEN) Ogive:

* * *
118 Gr. (1.00″ J4 **1:17.75″ twist) BC .35

125 Gr. (1.00″ J4 **1:17.75″ twist) BC .36

134 GR. (1.080″ J4 *1: 16.5″ twist) BC .38

136 Gr. (1.150″ J4 1:15″ twist) BC .39

BTW, even if you don't use Randy's bullets, he'll usually be more than happy to help you, via email or phone call. Not too much to say he's the modern father of the .30BR (Jim Stekl is the grandfather).

Here is the link for Randy:


http://www.bibullets.com/products/

TomD
09-27-2010, 03:09 PM
Not too much to say he's the modern father of the .30BR (Jim Stekl is the grandfather).

Here is the link for Randy:


http://www.bibullets.com/products/

I thought Ronnie Long was in there some where.

"Success has many fathers, failure is an orphan". I think that's a quote from the Democratic National Committee or somesuch---

B SLAGLE
09-27-2010, 08:40 PM
Thanks for all the help guys. I talked with Randy Robinett to day on the phone. He gave me some very good ideals and was very good at answering all my questions and then some more on the 30BR. I think that I am going to try a Kriger 22 1/2" 1 & 19 twist with a zero free bore and use the shorter J4 jackets (.950) that Randy makes.

Edwin D
09-28-2010, 06:57 AM
RONNIE LONG was certainly in there!

Charles E
09-28-2010, 07:14 AM
He was, certainly. Nice guy, too.

Except . . . back in the late 1990s, I think, I was shooting my .30 BR in a few HV group matches. Took a lot of kidding & a few "obviously, this guy is too stupid to pour pi$$ out of a boot."

Well, I don't shoot that well, but the rifle was good enough that it got a place or two, and was always in the top 10. This is back back when there were 40+ shooters at a match.

Now at one of them, Ronnie Long was there. Shooting a 6 PPC. Talk about feeling betrayed.

The .308 x 1.50 goes back a long way, & maybe Jim Stekl wasn't even the first. For all I know, there was a .30/06 X 1.5. Unlike things with DNA, ideas have a lot of parents.

Donald
09-30-2010, 01:39 AM
I have a30BR Brux on a Stiller action. It is 1/17 twist. It is a good shooter but not fantistic, could be me (:)). It shoots the 115/116 just fine. It also suprisingly shoots the Sierra 135 BTMK just fine. It is just on the edge but do a caluculation on the wind drift of the 112-116 against the 135 and also the 6mm 68 grain. I can push the 135 MK to 2850 with no problems.

Donald

abintx
09-30-2010, 09:38 AM
There's a lot of great info here on the 30BR by Randy Roninett and others: http://www.6mmbr.com/30BR.html. It's good to back to and review once in awhile. :)

R.G. Robinett
09-30-2010, 10:27 AM
I was, fortunate, indeed, to have been, "in on the ground floor" of the contemporary 30BR. The idea of adapting/adopting the case and combining it with 'properly' twisted barrels, WAS Ronnie Long's idea - at that time, I was merely a misguided Hunter Class fanatic.;) While I provided fodder and cheerleading, Ronnie, Joe Entrekin, and 'HUMBLE Henry' Rivers performed most of the trench digging and sniper duties.

My ego does demand that I take credit for SELLING the concept of matching correct [so called, slow] twist rates with the short-for-caliber bullets, which, via our Hunter rifles, prior to the 30BR concept, yours truly and a few pals (chief among them, [the late] Roy Oines), during registered competition, had thoroughly proven.

As Charles pointed out, there was probably a 1.5x30/06 - hell, there could have been a 1.5x.30/03!:eek::D If there's a case, it's been wild-catted . . . and probably simultaneously, by several 'inventors'.;)

Ronnie's idea was solidified following, as I recall, a successful season (possibly two seasons) of campaigning 30x47 HBR chambered 1:18" twist Morrison barrels - and, with a HIGH ratio of wins. Ronnie and I invested several phone calls discussing the potential [of a 30 Cal. version of the BR case] for BR work. Previously, my experience with 30 BR chambering had been brief exposure to a couple of rigs (Rem XPs) used for handgun silhouette competition. Following some discussion and calculating velocity potential, Ronnie ordered, 'the first" reamer. While our 'claim-to-fame' was merely combining the case capacity, twist rate, and bullet weight, to achieve the best precision potential . . . as they say, 'the rest is history" . . .:) When discussing this topic, I hope that I have always made Ronnie's concept/involvement clear. :D Perhaps Ronnie will add some comments and/or clarify any errors/lapses in my memory.:D

Good shootin'! RG

Pete Wass
09-30-2010, 10:56 AM
I have a30BR Brux on a Stiller action. It is 1/17 twist. It is a good shooter but not fantistic, could be me (:)). It shoots the 115/116 just fine. It also suprisingly shoots the Sierra 135 BTMK just fine. It is just on the edge but do a caluculation on the wind drift of the 112-116 against the 135 and also the 6mm 68 grain. I can push the 135 MK to 2850 with no problems.

Donald

Not all barrels are fantastic shooters. Regarding the Sierra bullets, I think most people who shoot them in competition successfully sort them according to their Ogive length for success. I recently tried some bullets made on a 1.080 jacket that would not shoot in the 1-18 twist on the rifle I shot them in. The best group I got was over an inch and all the holes were sideways olyptical in shape.

There are a few people shooting the longer bullets and find an advantage for them, in the wind. They don't win every match though and those who best them are usually shooting shorter bullets. It is tough to beat the wind, no matter what we do. Great flag reading ability trumps about anything else.

Donald
09-30-2010, 11:30 AM
" It is tough to beat the wind, no matter what we do. Great flag reading ability trumps about anything else."

Oh so true.

Donald

R.G. Robinett
09-30-2010, 04:21 PM
Not all barrels are fantastic shooters. Regarding the Sierra bullets, I think most people who shoot them in competition successfully sort them according to their Ogive length for success. I recently tried some bullets made on a 1.080 jacket that would not shoot in the 1-18 twist on the rifle I shot them in. The best group I got was over an inch and all the holes were sideways olyptical in shape.

There are a few people shooting the longer bullets and find an advantage for them, in the wind. They don't win every match though and those who best them are usually shooting shorter bullets. It is tough to beat the wind, no matter what we do. Great flag reading ability trumps about anything else.

Bullets based on the 1.080" jacket length, via a 1:18" twist barrel have very little prospect of working - in ANY conditions - the Sg is about 1.1.:eek: The 1:17" twist barrels, for FB bullets of up to 1.10" long (finished length), will impart a solid 1.4 Sg - this is the LOWEST reliable Sg. Keep 'em ON the X! RG

Edwin D
09-30-2010, 04:45 PM
MR. Robinette,

you are one of the TRUE gentlemen of the game.

Thank you for your enormous contribution.