Small primer in 6.5X47 Lapua

Discussion in 'Reloading' started by Natty Bumpo, Jul 21, 2008.

  1. Natty Bumpo

    Natty Bumpo Well-Known Member

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    Was curious why the 6.5X47 Lapua uses a small rifle primer. I see, according to the Vhitavouri reloading manual, with a 123 grain bullet, max loads call for 36-40 grains of powder. About the same as a .22-250. Seems like a lot for a small rifle primer. But, I figure the guys at Lapua know a bit more about internal ballistics than I do, so they must've had a good reason. Do most of the BR and PPC cartridges use small primers too?
     
  2. eddybo

    eddybo Well-Known Member

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    The PPC and BR both use small rifle primers. I have had no ignition problems at all using 40+ grains of powder in the 6x47 and 6.5x47. I am using winchester primers, a lot of guys are using the cci 450 magnum primers.
     

  3. spmorgan

    spmorgan Member

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    6.5 x 47 Lapua

    I built a hunting rifle on the 6.5x47Lapua cartridge on a weatherby vanguard action and the combination is brilliant, the rifle drops Roos & goats very well out to the 500yds so I reckon they got the ballistics using the small primer spot on. Shane
     
  4. goodgrouper

    goodgrouper Well-Known Member

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    When the lapua x47 was in prototype stage, it was a large rifle primer pocket. Then it was changed to a small and they found it provided better ignition and more consistency which translated to better accuracy as well.

    The 6 br also went through similiar changes in it's conception. The 6ppc does also use the small primer.
     
  5. LRHWAL

    LRHWAL Well-Known Member

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    I don't have enough experience to be commenting from experience :), but from all I've read, the small primer pocket handles pressure better and takes longer to loosen (i.e. better brass life). That's logical - there's more brass around the hole! Also generally (again hearsay) more consistency and accuracy. Rem made 308 Brass with small primer pockets at one time too for the accuracy nuts as I understand, although I never saw any here in South Africa.

    I'm sure the guys who really know from experience will chime in.