What small rifle primer for the Lapua 6.5 CM Case

Discussion in 'Long Range Hunting & Shooting' started by Gregory Duerr, Jun 12, 2018.

  1. Gregory Duerr

    Gregory Duerr Active Member

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    I have been using the Lapua Brass in my 6.5 CM the load that im using is 42.4gr H4350 and the 140 Berger VLD 2.817 COAL...........im using Federal 205M primers. I have noticed that a lot of reloaders for the 6.5 CM are using CCI 450 Primers............I have not had any issues with useing the 205M but was wondering it the magnum primer would work better??
     
  2. sean30ber

    sean30ber Well-Known Member

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    Not sure it would work better per se. I run BR-4s with good results but also run a standard #41 military with only a +-3 difference in standard deviation but and a touch in velocity. My Bergara's crater primers bad so the extra thickness in the 41 are nice. I think it matters with what you are doing. Are you bench shooting were every little detail is accounted for, Are you shooting PRS, Hunting/Target, 450s are a great primer. Find one your gun likes. But that's not a scientific answer either. Ill leave that to the scientists.
     
  3. dsculley

    dsculley Well-Known Member

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    I have used both CCI 450 & CCI 400 in my 6.5x47. I can't see a real difference in the two on my target. Before i got my firing pin bushed I was having issues with pierced primers with the 400's. Would crater the 450's but none pierced.
     
  4. Barrelnut

    Barrelnut Well-Known Member

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    Lots of folks use the CCI 450s because their "large" firing pin can crater and even puncture the softer and thinner F205 primer case in the Lapua brass. They also use the CCI 450 because they are on the RL26 powder bandwagon and want to get their EX and SD down.

    I am not so sure they will help with H4350. Might get a little higher speed, if you need it. Might knock you off your node and you will have to lower your powder charge (you need to lower it anyway and work up with the new primer). Might or might not lower your SD. Only way to know for sure is to try them.

    Like Sean said, not a scientific answer.
     
  5. lancetkenyon

    lancetkenyon Well-Known Member

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    I bought 2000 BR-4s to shoot in my 6CCM with Lapua SP 6.5CM brass. Always had great luck with them in other SP cartridges.
     
  6. MagnumManiac

    MagnumManiac Well-Known Member

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    I use FED205M in my 6.5x47 with Lapua brass and 142gr ABLR, interesting that a magnum primer gave me the same size group with a node 100fps faster, but was hard on the brass so I didn’t use it.
    With the 129gr ABLR the only load that worked was with a 205magnum primer.

    Cheers.
    :)
     
  7. Farmerboy78

    Farmerboy78 Well-Known Member

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    I run the CCI 400 & 450. But, mainly the 450 in larger cases due to the thicker cup.
     
  8. codyadams

    codyadams Well-Known Member

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    In peterson srp .260 brass, I tried cci 450, cci br-4, and federal gold medal match small rifle primers, and my lowest e.s. and s.d. was by far with the br-4. They had an e.s. of 9 and s.d. of 3.8 with 5 shots, the others were 21 fps and 24 fps e.s. This was in a .260 ackley, formed brass.

    What I would do, is just load up with several different primers and see what you get your best e.s. with. If you have your load worked out, the last thing you can do now is try different primers, and find what works best in your rifle.
     
    Rich Coyle likes this.
  9. Greyfox

    Greyfox Well-Known Member

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    I have had been satisfied with the accuracy and ES with the CCI BR4’s.

    D1B5A2FF-16A1-4679-B965-048F0B447DBA.jpeg
     
  10. Farmerboy78

    Farmerboy78 Well-Known Member

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    In my Peterson srp 6.5 creedmoor brass using CCI 450 I have an es of 13 and ad of 7
     
  11. MudRunner2005

    MudRunner2005 Well-Known Member

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    The 450 "magnum" primer has a thicker shell to prevent slam-fires. This is caused in semi and full autos when the bolt rams another round home, it hits the primer when seating the round into the chamber, and causes the round to fire if the primer has a thin shell, or is sticking out slightly proud compared to your other normal primer depths. Magnum small rifle primers don't always prevent this (if something is wrong with the gun itself), but for the most part it's just good practice to use CCI 450 primers in semi-auto rifles.
     
  12. Farmerboy78

    Farmerboy78 Well-Known Member

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    The 450 primer has a thicker cup and is used mainly in larger cases such as the creedmoor due to higher pressures present, you won't have as much visible pressure signs over the 400. And also gives you a little more room to not pierce the primer. Also, they aren't a br rated primer, but are very consistent and quite a bit cheaper cost over the br.
     
  13. BEEMAN

    BEEMAN Well-Known Member

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    I’ve been very happy with the 450’s in both of my 6.5x47’s. Live in southern Manitoba and shoot down as low as -20 to -30C. But will also say that I’ve never tried another primer.