New to 30 BR - Robinnett case specs

D

danyboy

Member
HI everyone. I have experience .308 but none with 30BR. I have a spanking new Shillen 1:17 twist with Robinnett 30BR chamber.
I have been looking on the net for case specs for this caliber without any luck.
Question: How long is this case supposed to be ? Would 1.5" be reasonable trim length ?
Thanks ,
 
Last edited:
Type "Robinett reamer" ...

in the Search box in the upper right and you can spend the rest of the week reading posts about "Robinett" specs. Good luck.
 
danyboy said:
HI everyone. I have experience with 30 BR and .308 but none with 30BR. I have a spanking new Shillen 1:17 twist with Robinnett 30BR chamber.
I have been looking on the net for case specs for this caliber without any luck.
Question: How long is this case supposed to be ? Would 1.5" be reasonable trim length ?
Thanks ,
Click to expand...

The industry standard for the 30BR has settled in on a .330 neck, zero freebore, and trim to length of 1.500 to 1.510.

Since Randy kinda invented this concept, those reamer specs have become known as the Robinette.

But there other 30BR reamers out there. Call your gunsmith.
 
You should have

or can get from the reamer maker, a reamer print. That will give you the specifications of your chamber, like length, freebore amount, throat angle, etc. Check you reamer spec. I trim my cases about .005" short of my 1.52" chamber length.
 
dannyboy:

Respectfully, making 30BR cases from 308W is not only doing things the hard way but will almost certainly result in chambering/sizing/extraction issues.

Get some Lapua 6BR cases and make your life sooooo much easier! ;)

Good shooting. -Al
 
glp said:
or can get from the reamer maker, a reamer print. That will give you the specifications of your chamber, like length, freebore amount, throat angle, etc. Check you reamer spec. I trim my cases about .005" short of my 1.52" chamber length.
Click to expand...

Greg, THE problem: which reamer print?!!?:eek: If the smith cannot/will not say, one needs a new smith!:p;)
Sadly, some appear to have not a clue . . . to quote Bob Dylan - again - "the times they are a changin' . . . ":(RG
 
well go look at all the steps you used to get you there.
all the time and money spent.
fire form a 6br case in the chamber( no bullet, fast pistol powder), trim and turn.
duh
you made this way too hard, and did you get your 308 cases with small primer pockets ??

danyboy said:
Al Nyhus said:
dannyboy:

Respectfully, making 30BR cases from 308W is not only doing things the hard way but will almost certainly result in chambering/sizing/extraction issues.

Get some Lapua 6BR cases and make your life sooooo much easier! ;)

Good shooting. -Al[/QUOTe
Chambers well, extracts well . pretty sure much easier than enlarging 6 mm neck . only drawback is having to turn .018" from necks. I will make this work. Just a matter of time and patience.
Click to expand...
Click to expand...
 
rsmithsr said:
well go look at all the steps you used to get you there.
all the time and money spent.
fire form a 6br case in the chamber( no bullet, fast pistol powder), trim and turn.
duh
you made this way too hard, and did you get your 308 cases with small primer pockets ??



Lapua .308Win Palma for example.

No headspace variation in the "no bullet,fast pistol powder" method, depending on extractor claw/rim thickness play ?
Click to expand...
 
OliveOil said:
rsmithsr said:
well go look at all the steps you used to get you there.
all the time and money spent.
fire form a 6br case in the chamber( no bullet, fast pistol powder), trim and turn.
duh
you made this way too hard, and did you get your 308 cases with small primer pockets

Olive oil,
You are wright. I since changed the way I form 30 BR going the 6 BR to 30 BR way and yes, much easier. Thanks.
Click to expand...
Click to expand...
 

Attachments

  • 30BR.et.308x1.5.jpg
    30BR.et.308x1.5.jpg
    2.1 MB · Views: 316
Last edited:
I fireform all my wildcats, including my 6BRto30BR, with Bullseye and a wax plug. Of course I have to rebate the rims to PPC size to use in my PPC. It takes very very little to expand the neck. I don't like to work my brass a lot doing the forming and etc.
 
danyboy said:
I just sent an email to the BC outfit that got it made by an Oregon company. Didn't think there would be so many variants in this Robinett chamber !
Click to expand...

There should NOT be a single variation and still be marked "30BR ROBINETT" - anything else is something else, and should be so designated - it certainly should not bear my name. :mad: That said, alteration may be either good, or bad - but either way, a reamer bearing a single change is certainly NOT to my original specs . . . I'm headed for margaritaville . . . well, following this brief commercial . . .

The original SAAMI OAL spec for the 6mm BR was 1.570": Lapua 6mm BR "NORMA" brass, of a Gold Box, is usually about 1.555" OAL; Original Rem. 6BR brass, 1.555-1.559" OAL. A mechanical necking-up process will always shorten the brass considerably, and, depending upon tooling/lube/etc., vary considerably (Lot to Lot) as well. One MUST KNOW the reamer specs, and even then, determine that the reamer matches the print!!:eek: The 30BR IS a wildcat, and as such, there is not a standard specification - prudence is a must.:pRG
 
Last edited:
R.G. Robinett said:
There should NOT be a single variation and still be marked "30BR ROBINETT" - anything else is something else, and should be so designated - it certainly should not bear my name. :mad: That said, alteration may be either good, or bad - but either way, a reamer bearing a single change is certainly NOT to my original specs . . . I'm headed for margaritaville . . . well, following this brief commercial . . .

The original SAAMI OAL spec for the 6mm BR was 1.570": Lapua 6mm BR "NORMA" brass, of a Gold Box, is usually about 1.555" OAL; Original Rem. 6BR brass, 1.555-1.559" OAL. A mechanical necking-up process will always shorten the brass considerably, and, depending upon tooling/lube/etc., vary considerable as well. One MUST KNOW the reamer specs, and even then, determine that the reamer matches the print!!:eek: The 30BR IS a wildcat, and as such, there is not a standard specification - prudence is a must.:pRG
Click to expand...

The price of fame;)

Randy, you have reached the vaulted status with iconic monikers such as Coca Cola. Everybody knows that Coca Cola is a specific product, but how many times a day are the words....”hey, let’s go get a Coke” repeated knowing some might really be opting for another brand entirely.

I am as guilty as anybody. Everybody in the 30BR World Unceremoniously identifies a zero freebore 1.5 inch or so long reamer as ”Robinett”.

Shooters will ask me about this, and I say it depends on how you make your brass. If you neck up the 6BR, what you stated happens, the metal gets pushed back and your case ends up in the vicinity of 2.5+ inches. If you make cases the way I do by blowing them out, much of the original 6BR length is retained, hence my reamer has a trim to length of 1.545.

Aside from that, it is a typical zero freebore 1.5 degree throat 30BR.

If shooters say they will be necking up with dies, I say.......”get a Robinett”. So I guess I am part of the problem.
 
R.G. Robinett said:
There should NOT be a single variation and still be marked "30BR ROBINETT" - anything else is something else, and should be so designated - it certainly should not bear my name. :mad: That said, alteration may be either good, or bad - but either way, a reamer bearing a single change is certainly NOT to my original specs . . . I'm headed for margaritaville . . . well, following this brief commercial . . .

The original SAAMI OAL spec for the 6mm BR was 1.570": Lapua 6mm BR "NORMA" brass, of a Gold Box, is usually about 1.555" OAL; Original Rem. 6BR brass, 1.555-1.559" OAL. A mechanical necking-up process will always shorten the brass considerably, and, depending upon tooling/lube/etc., vary considerable as well. One MUST KNOW the reamer specs, and even then, determine that the reamer matches the print!!:eek: The 30BR IS a wildcat, and as such, there is not a standard specification - prudence is a must.:pRG
Click to expand...
Dealer that got my new Shillen barrel made in Oregon didn't like the idea of showing me the reamer print used to cut the chamber. He claims I'm the first to ask in 20 years !
 
jackie schmidt said:
The price of fame;)

Randy, you have reached the vaulted status with iconic monikers such as Coca Cola. Everybody knows that Coca Cola is a specific product, but how many times a day are the words....”hey, let’s go get a Coke” repeated knowing some might really be opting for another brand entirely.

I am as guilty as anybody. Everybody in the 30BR World Unceremoniously identifies a zero freebore 1.5 inch or so long reamer as ”Robinett”.

Shooters will ask me about this, and I say it depends on how you make your brass. If you neck up the 6BR, what you stated happens, the metal gets pushed back and your case ends up in the vicinity of 2.5+ inches. If you make cases the way I do by blowing them out, much of the original 6BR length is retained, hence my reamer has a trim to length of 1.545.

Aside from that, it is a typical zero freebore 1.5 degree throat 30BR.

If shooters say they will be necking up with dies, I say.......”get a Robinett”. So I guess I am part of the problem.
Click to expand...

NO, you are not - it's the reamer make who would put any known moniker on a reamer of differing dimensions.:eek:
Regardless of reamer specs, or, case-forming method, the smith,should, at least, be able to provide the customer with the maximum OAL! If the smith cannot/will not share this critical info, it's time for a different smith.;)

Our problem, is that we do our own stuff, so, what does it matter . . . we just make it fit - that's what a wildcat dictates.

The BIG issue is when one gets a 1.570" OAL (got that call again yesterday), and is using 1.510" long brass, which with a 1.75 Deg. leade angle, is still "ok" . . . but, since most opt for a 1.5 Deg. angle , it becomes both mechanically and mentally "difficult" to make my bread-and-butter [10 ogive] bullet "work"(moves ogive contact point away from bolt-face another 0.030" , or, so).:p The poor user calls and states, "I have a 'Robinett' reamer, but can't reach the lands" . . . that's the first indicator of, "Houston, we have a problem" . . .

Really, I cannot figure out how I became the goat - Ronnie Long initiated the contemporary 30BR craze . . . I was simply a cheer-leader and mentor of sorts (barrel twist, which we had established as ROCK SOLID via Hunter Class Rifles), etc. THE Guys were "Humble Henry" Rivers, "Smokin' Joe" Entrekin, & the previously mentioned Mr. Long.;) Long live BR shootin'! RG
 
Last edited:
R.G. Robinett said:
NO, you are not - it's the reamer make who would put nay moniker on a reamer of differing dimensions.:eek:
Regardless of reamer specs, or, case-forming method, the smith,should, at least, be able to provide the customer with the maximum OAL! If the smith cannot/will not share this critical info, it's time for a different smith.;)

Our problem, is that we do our own stuff, so, what does it matter . . . we just make it fit - that's what a wildcat dictates.

The BIG issue is when one gets a 1.570" OAL (got that call again yesterday), and is using 1.510" long brass, which with a 1.75 Deg. leade angle, is still "ok" . . . but, since most opt for a 1.5 Deg. angle , it becomes both mechanically and mentally "difficult" to make my bread-and-butter [10 ogive] bullet "work"(moves ogive contact point away from bolt-face another 0.030" , or, so).:p The poor user calls and states, "I have a 'Robinett' reamer, but can't reach the lands" . . . that's the first indicator of, "Houston, we have a problem" . . .

Really, I cannot figure out how I became the goat - Ronnie Long initiated the contemporary 30BR craze . . . I was simply a cheer-leader and mentor of sorts (barrel twist, which we had established as ROCK SOLID via Hunter Class Rifles), etc. THE Guys were "Humble Henry" Rivers, "Smokin' Joe" Entrekin, & the previously mentioned Mr. Long.;) Long live BR shootin'! RG
Click to expand...
Just keeping sounding the warning like you are is all you can do
It saved me from buying a Robinett reamer with 1.545 chamber length

Thank you !!
 
You must log in or register to reply here.
Back
Top