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Robinson XCR, 1-9 Twist, and 75-77 grain 5.56 rounds

Discussion in 'Rifle Country' started by HorseSoldier, Nov 6, 2008.

  1. HorseSoldier

    HorseSoldier Well-Known Member

    Thinking about adding an XCR to the collection, and was wondering if some owners and/or those familiar with the design could provide some information on how the XCR runs with heavier 5.56 bullets.

    From what I see on Robinson's website, the XCR in 5.56 is only offered with a 1-9 twist rate. My two existing 5.56 rifles are both 1-7 twist, and I prefer running 77 grain ammo through those. Having to stock two different bullet weights in 5.56mm would be almost as much trouble as stocking two seperate calibers, so I'm thinking the potential purchase probably hinges on how well the XCR/1-9 twist combo does with 75-77 grain rounds.

    I'm not necessarily looking for a quarter-MOA bench rest or uber-mallninja performance, but just wanted to verify the XCR delivers service rifle/patrol carbine acceptable sort of accuracy with heavier bullets.
  2. Slvr Surfr

    Slvr Surfr Well-Known Member

    I own one but I can't give you an answer as all of run through mine is 55gr ammo. Here is where I can point you to hopefully get your answers:

  3. everallm

    everallm Well-Known Member


    If I recall correctly, Robinson Arms did say that they tested 75gr in 1:8 and 1:9 barrels and saw minimal difference.

    Mine is good to go with 75gr A-Max's but I have one of the first run 1:8 heavy barrel XCR's so don't want to prejudice the answer for the current barrek

    Go to www.xcrforum.com and post the question there, owners will be able to give you real world experience
  4. HorseSoldier

    HorseSoldier Well-Known Member

    Thanks for pointing out the link. They've actually got a thread about the exact question I had and the 2-3 XCR shooters who've tried 77 SMKs and other heavy bullets report good results out to 100, and then some looser groups than an AR shooters past that. Nobody talking about keyholing, though, which was my main concern (having seen some M16A1s loaded with green-tip on a range once . . .).
  5. ny32182

    ny32182 Well-Known Member

    I could try 77's in mine, but have not so far... the reports I have seen from those that have state that the accuracy is not bad, but not as good as in a 1:7 barrel. That is pretty standard, and I doubt those results are going to change just because the barrel is sitting in an XCR reciever rather than in an AR.

    Since I already have some 1:7 AR's, I don't mind that the XCR is a 1:9 for varieties sake... historically I have found that the 1:9's tend to shoot the lighter-than-77 stuff a little better for me anyway.

    I have not done a lot of accuracy testing in my XCR, but plan to do so soon. I have loaded up some 69gr SMKs and 60gr VMAXs.
  6. zx12rider

    zx12rider Well-Known Member

    not to hijack but

    How do you guys like your XCR's? I was thinking about ordering a CT compliant one with fixed stock and perm brake. 16" barrel
  7. Horsesoldier, could you please post a direct link to the thread in question you found addressing your exact question (on XCR forum)? Thanks.

    zx12rider, so far, so good - love it. But haven't shot it much yet.
  8. ny32182

    ny32182 Well-Known Member

    Mine is all good so far:


    Magpul covers and MIAD grip, Bobro short grip, Troy BUIS, TA11F w/LT100. Since that pic I have gone to the large MIAD backstrap which I have always preferred, and added a "gapper"... she's just about perfect in 5.56 config. I would like to get either the 6.8 or 6.5 parts for it sometime in the future as well.

    These are some groups with ordinary Hornady 55gr FMJ and ~23gr H335:

  9. Slvr Surfr

    Slvr Surfr Well-Known Member

    Love the rifel, hate the trigger. It has one of the worst out of box triggers I have ever felt. Sometimes its a one stage and others times a two stage. The rifle itself is well engineered, and rock solid. The trigger solution is cheap. I can send it off and it will come back with a smooth single stage trigger. Other than that I haven't gone to any carbine classes with it yet. I've only had around 300 rounds through mine, and not a single hiccup.
  10. ny32182

    ny32182 Well-Known Member

    I had the Springfield 4.5lb single stage job done on mine... well worth the $49.

    There is also a factory match trigger in the pipeline from RA.
  11. HorseSoldier

    HorseSoldier Well-Known Member

    It's in the 5.56mm subsection: http://xcrforum.com/index.php/topic,1024.0.html
  12. everallm

    everallm Well-Known Member


    Rob Arms posted today on XCR forum that they are crazy busy and have a bit of a backlog on rifles and components...... No real surprises there.

    If you are really interested probably the best go to guy to order from who carries stock is Kermit Zahm

    Kermit Zahm
    Wild Thang Farms
    3150 Fuller Rd
    Emmett , Idaho 83617
    phone 208-869-1616
    Fax # 208-365-4272
    FFL 9-82-045-01-7D-35203

    I live in NJ and have to get the same model as you guys in CT and he was excellent.
  13. Slvr Surfr

    Slvr Surfr Well-Known Member

    That is what I was referring to as a cheap fix. I have read nothing but good things about his trigger job.
  14. tacweapon

    tacweapon Well-Known Member

    This is my Robinson Arms XCR


    I do not mind the trigger but that said I do plan on seeing what there match trigger is like or getting a Bill Springfield trigger job

    Here is what I was able to get using a 16 inch heavy barrel and 55gr Black Hills Ammo


    That was taking a shot as soon as I had my target picture back on a 2x TruGlo optic so the shots were fairly rapid, if I had taken my time and or had a better optic I know I would have done better

    I would imagine you would have about the same groupings with the heavier bullets, I have shot up to 68gr and the groups were about the same as what I get with the 55gr and 62gr

    I hope this helps
  15. tacweapon, nice group - that is a deadly weapon in your hands right there! That's good shootin for a 4 power scope (millet dms) at 100.

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