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Thread: New to 30 BR - Robinnett case specs

  1. #16
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    [QUOTE=OliveOil;835295]
    Quote Originally Posted by rsmithsr View Post
    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 ?
    Olive oil,
    No LR primers. Money spent ? I had the forming set prior to this 30BR project since I've had a .308 x 1.5 rifle. I could have fireformed some 6BR cases but decided to try this out anyway. I understand forming 6BR cases is not that much easier either. You end up with this donut in the neck, stretching the neck also brings its share of case life problems. I preferred the idea of reducing neck size rather than stretching it out.
    This morning, checked one of my sized 308 x 1.5 cases (on the left) and compared it to newly formed 30BR unfired one. Plenty of room for more powder in the 308 x 1.5 one. If my range can finally re-open (covid19 ), I'll fireform the 30BR ones them and see what happens then.
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    Last edited by danyboy; 05-29-2020 at 04:09 PM.

  2. #17
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    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.

  3. #18
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    I really like the use of 'excedent'

  4. #19
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    Quote Originally Posted by danyboy View Post
    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 !
    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. 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!! The 30BR IS a wildcat, and as such, there is not a standard specification - prudence is a must.RG
    Last edited by R.G. Robinett; 05-29-2020 at 01:41 PM.

  5. #20
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    Quote Originally Posted by R.G. Robinett View Post
    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. 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!! The 30BR IS a wildcat, and as such, there is not a standard specification - prudence is a must.RG
    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.

  6. #21
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    Quote Originally Posted by R.G. Robinett View Post
    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. 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!! The 30BR IS a wildcat, and as such, there is not a standard specification - prudence is a must.RG
    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 !

  7. #22
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    Quote Originally Posted by jackie schmidt View Post
    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.
    NO, you are not - it's the reamer make who would put any known moniker on a reamer of differing dimensions.
    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). 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 by R.G. Robinett; 06-01-2020 at 10:51 AM.

  8. #23
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    Quote Originally Posted by R.G. Robinett View Post
    NO, you are not - it's the reamer make who would put nay moniker on a reamer of differing dimensions.
    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). 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
    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 !!

  9. #24
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    Quote Originally Posted by Tim Singleton View Post
    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 !!
    1.545...... Holee KuRAPPP!!!...... "carbon ring anyone??"

    I once had a guy build me a "no-neckturn 6BR" and he sent it to me with an I.5 flat chamber. And didn't tell me. And then fought me about getting a reamer print after I blew primers out with the lowest load in the manual!!

    I no longer use reloading manuals
    I no longer fire ANYTHING without physically measuring it and
    I no longer trust any information from any source unless the fellow is absolutely HAPPY to prove it nine ways from Sunday

    IMO ain't no room for "opinions" re safety

    But that said there are hundreds of nice safe iterations of "30BR" "6X47L" "30X47L" "Ackley" "Creedmoor" "Improved" where the biggest problem is die fittage.

    LISSEN to these guys in this thread!

    "Straight From The Source's Mouth"

  10. #25
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    Quote Originally Posted by R.G. Robinett View Post
    NO, you are not - it's the reamer make who would put nay moniker on a reamer of differing dimensions. RG
    Randy, here's an interesting side note on one reamer maker's take on a 'proprietary' reamer:

    When Stan Ware and I finalized the dimensions for our .085 neck length .30 WolfPup, Dave Kiff @ PTG told Stan it would be proprietary to Stan's company, SGR Custom Rifles. Following our initial success with it at registered IBS and NBRSA tournaments, Stan took several calls from people that had inquired with PTG about having an dimensionally exact reamer made. They had been directed to Stan by PTG, as Dave stuck to his word. Interestingly, this also included a PPC-based variant for a well known Group shooter that was looking into the concept.

    Good shootin'. -Al

  11. #26
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    Turned out brass I used to form for 30BR was .010" thicker than Lapua brass when measuring a cut case halfway between the head and the shoulder of both, after fireforming, which would probably explain difference case capacity.
    Last edited by danyboy; 05-31-2020 at 02:53 PM. Reason: change

  12. #27
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    Quote Originally Posted by Al Nyhus View Post
    Randy, here's an interesting side note on one reamer maker's take on a 'proprietary' reamer:

    When Stan Ware and I finalized the dimensions for our .085 neck length .30 WolfPup, Dave Kiff @ PTG told Stan it would be proprietary to Stan's company, SGR Custom Rifles. Following our initial success with it at registered IBS and NBRSA tournaments, Stan took several calls from people that had inquired with PTG about having an dimensionally exact reamer made. They had been directed to Stan by PTG, as Dave stuck to his word. Interestingly, this also included a PPC-based variant for a well known Group shooter that was looking into the concept.

    Good shootin'. -Al
    Al, I may not have been clear - not on this thread, but have been on others - the [so called] Robinett reamer is the exact opposite of the circumstance with The WolfPup/SGR: that is, when asked, by Dave, I stated that my specs were NOT to be considered proprietary - let anyone who wants one have it. Hell, even I can put numbers on paper!! I was neither asked, nor did I ask, or, grant permission to use my name on any reamer, let alone on reamers of varying dimensions! I'll stick to my guns, by either name, or, number, a set of dimensions is just that set, and nothing else. RG

  13. #28
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    I find Dave's dilemma fascinating.

    IMO he is absolutely honorable but he knows E V E R Y O N E and everyone has a different perspective from "keep these specs locked in an underground vault" to "broadcast them to the world.....

    So Dave's stuck with knowing that one guy will Rick Jamison a thing to the bitter end while the next will Randy Robinett it from the rooftops.

    And he cain't allus remember which

  14. #29
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    reamer specs

    Quote Originally Posted by rsmithsr View Post
    ask the guy that CHAMBERED THE BBL!
    Retailer who sold me the chambered 30BR BBL told me he got it chambered by Pacific Tool and Gauge in Oregon and all they agreed to say was that the chamber neck was .330" and 0 bore.

  15. #30
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    Quote Originally Posted by danyboy View Post
    Retailer who sold me the chambered 30BR BBL told me he got it chambered by Pacific Tool and Gauge in Oregon and all they agreed to say was that the chamber neck was .330" and 0 bore.
    That will work just fine.

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