std LR or Magnum LR primers in 7 SS (or 7 SAUM, 7 WSM, etc.)?

Discussion in 'Big Stuff--7mm, 30 Cal, .338+' started by Winny94, Jun 28, 2019.

  1. Winny94

    Winny94

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    If you shoot a 7 short mag variant, do you run standard or magnum LR primers? Im getting a lot of conflicting reports, and with a limited barrel life (and a proof CF barrel), id like to limit my testing as much as possible.

    thanks!
     
  2. watercam

    watercam Gold $$ Contributor

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    Very good question. Magnum primers were originally asked for by Weatherby for their .300 W. Mag. to ignite 80+ grains of powder. For me anything above the low 60 grain range would warrant Magnum primers in a hunting load. For match loads I would test standard LRPs out to 600-1000 yds. for best ES/SD numbers.
     
  3. can1010

    can1010 Silver $$ Contributor

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    the guy that designed the 7ss uses only fed 210s. and to be honest I get better consistency in the 7 saum, 284 win and my 6.5 prc with standard large rifle primers
     
  4. ben_g

    ben_g

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    I use BR2’s in 284, 7 SAUM and 300WSM

    Results have been very good for me (used for F-open) that I haven’t yet had cause to try another primer.
     
    Last edited: Jun 28, 2019
  5. benchrest

    benchrest Silver $$ Contributor

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    7wsm i ran 215M magnum match. (69gr load)
    &
    7saum likes BR2's (60gr load)
     
  6. FrankG

    FrankG

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    I say you won’t know till you try and see what your gun/load likes.

    I wouldn’t even given a thought to trying CCI200’s in the .300PRC till Dave at work told me how excellent they where in his .300wm.

    My extreme spreads dropped to about 10 and sd’s to single digits. Better than 210M’s and better than mag primers and I’m loading mid 70’s for powder charges.

    Later, Frank
    Bartlein Barrels
     
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  7. LoanHarvey

    LoanHarvey Authorized Valdada Dealer Gold $$ Contributor

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    I just started testing on a 25 SAUM today, and the 210M's gave me better groups than the 215M's. YMMV
    This is with 60gr H1000.
     
  8. Willow

    Willow

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    Dependent on each barrel and powder combo to be honest. I know a guy here in Aus who has taken out a couple of Queens titles recently who runs CCI200's in his SAUM and his group size shrunk significantly when he switched to them.
     
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  9. rhovee

    rhovee

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    I run H1000 and about 65 grains of it in my 7 saum shooting 184’s. One barrel likes cci 250. Still trying to see what one is more consistent Fed 215 or cci 250 in my 28” barrel.
     
  10. wboggs

    wboggs Gold $$ Contributor

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    F210m shoot better groups with better ES/ED numbers in my 6.5PRC with 60 gr H1000. Accuracy really suffered with 215m.
     
  11. Lbart

    Lbart

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    Been using Wolf standard primers in my 7/270 WSM w/ Berger 180 & 184 hybrid loads for about 10 years with H-4831sc. 60+ grains. No problems, great groups @ 1k and low ES & SD's.
     
  12. mac86951

    mac86951 I prefer my targets level and unmoving Gold $$ Contributor

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    I agree; primer selection is like bullet selection; try them and work up.

    I'm happy with F215M for what it's worth.

    -Mac
     
  13. Longrange57

    Longrange57

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    7mm RSAUM, H1000 and CCI200....excellent results!
     
  14. Dgd6mm

    Dgd6mm Silver $$ Contributor

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    My 7RSAUM loved H1000 and LR primers.
     

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