Is the 6mmXC all that it's made out to be.

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by ajhardle, Jan 8, 2013.

  1. ajhardle

    ajhardle Well-Known Member

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    I was comparing this to the .243 Winchester in Berger's new reloading manual. Perfect case volume, acceptable bore wear, reduced brass flow and more accurate than the 6br.

    Big promises. I've been debating about my next rifle. Maybe chambered in 6XC.

    So, is it all that and a box of chocolates, or am I just drinking the kool-aid?
     
  2. Scot E

    Scot E Well-Known Member

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    There are a lot of guys and smiths here and on the Hide that really promote the XC. It has its basis in the competition world so that will tell you a bit about accuracy and performance.

    If I were doing a 6mm it would be between the XC, 6-Creedmore, and 6-6.5x47. With the latter you get more velocity but less barrel life, more recoil, and if your lucky the same accuracy as the XC.

    I would say it is the real deal and no cool-aid! :D



    If you haven't already, this is a good read. 6XC Cartridge Guide


    Scot E.
     

  3. Truc

    Truc Well-Known Member

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    I'd be skeptical about the claim of more accurate than the 6 BR. If you go to 600 yd match reports you will see 6BR or it's variation 6 Dasher etc. winning far more than anything else.
     
  4. Trickymissfit

    Trickymissfit Well-Known Member

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    I shoot an improved 6/250. Similar but improved . It'll push a 105 grain Amax at 3000 fps without going into over pressure, but would still consider it to be about as close to max as I wanta be. The 6XC is really nothing but a necked up 22-250, or a necked down .250 Savage case. the 6XC and the .243 both have similar issues, and the improved versions only marginally help fix the issues. They both show a neck length that's very close to .250", but you will find that it often comes out a little shorter than that. If you do the improved case, expect a neck length to finish out at about .230". The 6XC will be better in the case shrinkage department, as there should be very little. The shoulder angle is not so hot on either round. I planning on a 1200 round throat life in my barrel; which is far greater than a .243. But sorta lackluster compaired to a 6BR that will easilly go 2500 rounds.

    I know two or three guys that have been shooting the 6XC (or it's clones) over the last fifteen years or so. Most are shooting bullets in the 75 to 85 grain range. I think they are getting around 3250 fps with 80 grain bullets. That's pretty close to a .243. But a 6BR will also push an 80 grain bullet to about 3100 fps! With a lot less powder. I use .243 cases to form the 6/250AI, and I do this to get better cases with less case shrinkage ( you won't worry too much about that). But when this barrel finally goes south I'll rechamber it in 6BG. Very similar to the 6/250AI, but with a longer neck and a 30 dregree shoulder. The shoulder comes in at 1.552" verses the 1.514 of the 250 case.. I think I do all this with about a 1/8" set back and still clean up the throat damage (if not I'll go .25") The over all length will finish out right at what the standard .243 case length is, but with a .35" neck. But I'm tempted to ream the head space a little short to come in with a 1.48" shoulder length instead of 1.552". In otherwords a 6mm Int. on steriods with a 2000 round barrel life.
    gary
     
  5. Trickymissfit

    Trickymissfit Well-Known Member

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    I'll agree with you! I can't see it being more accurate, but with one exception. That would be out past 500 yards. Pindell once said that past 300 yards the 6BR was a better round than the 6PPC, but the 6XC has a about 5 to 6 grains more capacity so that has to help a little bit. But that changes with the 6BRX, or the Dasher. The Dasher is a pretty good round, but there were a few complaints a couple years back on B.C. over barrel life and split case necks. Never been around one, so I don't know if that's crap or not.
    gary
     
  6. Truc

    Truc Well-Known Member

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    I competed w/ the 6 Dasher and never had any problems w/ split necks but then I used Lapau brass and bushing dies to size the case neck
     
  7. Mikecr

    Mikecr Well-Known Member

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    You can get the 6XC brass in Norma which is very good. You won't have to fiddle with necking/reforming in 6XC.
    It is larger than the 6x47L and matching the 6-Creedmore capacity. Slightly bigger still is the 6CM, which invokes much cooler H1000 powder(to best all these in barrel life).

    There is the difference in primer size, which comes into play for competition loads with a 6x47L(very hot) -vs- milder loads with heaviest of bullets using a 6XC.
    I believe this results in better accuracy from a 6x47L(matching 6Dasher capacity & accuracy) through mid ranges, but leaving an edge to higher BC 115gr bullets at 1kyd from a 6XC (only in the wind).

    I shot a 6XC for maybe 10yrs, and still shoot 6BR.
    Beyond terminal ballistics, while not minding necking/reforming, I'd go 6Dasher or 6x47L. Both Lapua brass, and small primer pockets.

    Not that there is anything wrong with the 6XC. It really is a good & easy cartridge.
    It's just that you can't push very hot loads with it for long, and there are accuracy benefits to hot loads -with the right brass & cartridge design.
    With Norma brass, 6XC capacity, and large primers, you can't run hot loads without chasing your tail. I don't know anything about Creedmore's brass.
     
  8. Trickymissfit

    Trickymissfit Well-Known Member

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    either way you decide to make case (neck up or neck down) is really not much of a chore. We're only looking at .020" total.
    gary
     
  9. TOM H

    TOM H Well-Known Member

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  10. blipelt

    blipelt Well-Known Member

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    I was taught this summer how to make good brass for the dasher by "King Richard". We formed(cream of wheat method) 600 this summer in between myself and a buddy and we lost maybe 5. We competed at local varmint matches loosing of course to Richard with his dasher, but that is to be expected. Love that itty bitty caliber and it still amazes me what it is capable of.

    Brent
     
  11. shortgrass

    shortgrass Well-Known Member

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    The cartridges mentioned are all fine rounds. I own a XC and a Dasher. Both are made with quality components. As long as a human being is involved I'd be real hesitant to claim one is "more accurate" than the other. There's no 'free lunch' with either. Fire form one, a bit shorter barrel life with the other (I solved this problem of shortened barrel life by having the barrels on rifles I build for myself Melonite/Blk. Nitrided). The XC feeds immediately and without a 'hitch' from any magazine designed for the .308, that I've tried. Including the factory Rem., H-S Precision, and ACI. I can't say that about the Dasher. It took some thinkin' and experimenting to make it feed reliably from ACI mags. For F Class, ACTC or varmint hunting, if I was building for myself, I choose the XC or the 6 x 47mm L. because of the ease of feeding factor. If it was a single shot bench rifle I'd probably go with the Dasher. No one rifle/cartridge combination should be expected to "do it all"! I hear that alot, these days,,,,,, "want a rifle I can shoot bench rest, varmint hunt with, shoot F class matches with, and take deer and antelope hunting". Those words usually flow from someone with very little shooting experience.
     
  12. blipelt

    blipelt Well-Known Member

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    Shortgrass try a plain old staggerfeed remington bottom metal and put the dasher round in the middle of the magazine. Just another one of "King Richard" pearls of wisdom for the 6 dasher.

    Brent
     
  13. shortgrass

    shortgrass Well-Known Member

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    Trouble is my customer wanted ACI detachable mags. Required a block to keep the rounds from sliding back. "King Richards" pearls, well , they might be for someone who hasn't the experience with feed problems and alterations,, but that was part of the curriculum 20+ years ago when I went to'smithing school. I generally find my own way and apply common sense to finding solutuions rather than turning to the interdnet.
     
  14. Truc

    Truc Well-Known Member

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    While I won't shoot short range BR with this cartridge I do feel it will do the rest, I'm nearing completion on a 7 SAUM, Stiller action, Varmint contour barrel, Braked and easily changed from Greybull stock to a 3" Benchrest stock.