Rem 7 1/2 primers

Discussion in 'The Ammo & Reloading Forum' started by woodchuck3574, Jun 11, 2012.

  1. woodchuck3574

    woodchuck3574 New Member

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    Can the Rem 7 1/2 primer be used safely in reloading .30 carbine ammo? book calls for 6 1/2 but I have an abundance of 7 1/2.
  2. gdmoody

    gdmoody Moderator Supporting Member

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    I don't use Remington so I don't know what 6 1/2 or 7 1/2 are.

    If they are like small pistol and small rifle, if you start out at the lowest charge and work up it would be ok to use either.
  3. bobski

    bobski Former Guest

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    6 1/2 were replaced by the 5 1/2 and 7 1/2.
    problem with 6 1/2 was they were used across the board for everything and proved too hard for small cal's and too soft for big cal's.
    so remington designed the 5 1/2 thick for pistol magnums where heavy primer strikes were seen, and 7 1/2 were made for smaller cal's with softer strikes.
    i use 7 1/2 in 22 hornet. they are nice small cal bench rest primers.
    as far as 30 carbine? instincts tell me that should be a 6 1/2, because 7 1/2 might get punctured with the heavy pin strike of a military spec firing pin assy.

    my ref is handloaders digest 7th ed.
    Last edited: Jun 13, 2012
  4. armoredman

    armoredman New Member

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    I can't see that military firing pins would puncture a 7.5 since that's the one suggested to me to use in 5.56mm reloads...and they work perfectly in a military type action in that caliber for me. :)
  5. steve4102

    steve4102 Former Guest

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    Think you have your figures crossed here.
    The Rem 6 1/2 is a Small rifle primer designed for low pressure loads like the 22 Hornet. The Rem 7 1/2 is a Small rifle primer that works well with high pressure rounds like the 223.

    The Rem 5 1/2 is a Small Pistol magnum Primer not a rifle primer. The 5 1/2, 6 1/2 and 7 1/2 are still available from Remington. 5 1/2 Pistol. 6 1/2 rifle low pressure and 7 1/2 rifle high pressure.
  6. bobski

    bobski Former Guest

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    got lost in the translation.
    you are right.
    5 1/2 is pistol mag.
    but my book shows the 6 1/2 was dropped. was it brought back recently?
    if thats the case,them 7 1/2 would work in 30carbine.
    update me, please, because im using 7 1/2 in low pressure 22 hornets only because i couldnt find 6 1/2's.
    Last edited: Jun 11, 2012
  7. medalguy

    medalguy Member

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    Remington 6 1/2 is a small rifle primer
    Remington 7 1/2 is a bench rest small rifle primer

    7 1/2 is NOT a magnum primer, but it is manufactured to a tighter tolerance than the regular 6 1/2 primer. I was told by a Remington rep that the cup is slightly harder or thicker than the standard 6 1/2, so it's better for auto rifles, but later conversations with other Remington reps dispute the harder/thicker theory.

    All I can tell you is I use them in .223/5.56 reloading and they work fine. I don't see any reason why they would not work equally well in .30 Carbine. As always when changing compoments, drop back 10% and work back up.
  8. steve4102

    steve4102 Former Guest

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    From Remington:

    In rifle cartridges, the 6-1/2 small rifle primer should not be used in the 17 Remington, 222 Remington, 204 Ruger or the 223 Remington. The 7-1/2 BR is the proper small rifle primer for these rounds.

    Powder Valley and Graf's have 6 1/2 in stock. Midway has them out of stock "No Backorder". Maybe they have been discontinued, duno.
  9. steve4102

    steve4102 Former Guest

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    Actually the 7 1/2 is a Mag primer and a BR primer.

    http://www.lasc.us/primerchart.htm

    http://www.chuckhawks.com/primers.htm

    [​IMG]

    [​IMG]
  10. steve4102

    steve4102 Former Guest

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  11. bobski

    bobski Former Guest

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    i started using 7 1/2 when 6 1/2 was no longer available.
    so i will clean up my post like this...
    5 1/2 is for mag pistol.
    7 1/2 was the do all that replaced 6 1/2. they made it thicker to get rid of complaints of being soft.
    so, that still leaves the possiblity of old 6 1/2's still being softer than 7 1/2. why else would they have discontinued them and create a 7 1/2?

    i guess we need to now learn if the 30carbine is considered a hot round requiring the new 7 1/2?
    if old books show 6 1/2 used for 30 carbine, odds are that data was old, before complaints started being reported ???

    i would assume the 7 1/2 would be ok. agree?

    this sure has opened a can of worms!
  12. steve4102

    steve4102 Former Guest

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    The Rem 6 1/2 primer is still listed as a component on Remington's web site.
  13. bobski

    bobski Former Guest

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    or, brought it back?
    maybe they improved it and reintroduced it?

    again i say, why would they create a 7 1/2 if 6 1/2 was just fine?
    follow my thoughts?
  14. steve4102

    steve4102 Former Guest

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    The 7 1/2 has a thicker cup and is a Mag primer. The 6 1/2 has a very thin cup and should not be used in high pressure rounds like the 223.
    Last edited: Jun 12, 2012
  15. bobski

    bobski Former Guest

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    so i guess the original question was...is 30carbine considered a low pressure round that requires only a thin cup primer?
    it could be asked: 'would a 7 1/2 be too thick for the 30carbine reciepe asking for 6 1/2?'

    he asked us if the 7 1/2 could be used in place of the receipe calling for 6 1/2 primers?
    whats your opinion?
  16. steve4102

    steve4102 Former Guest

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    IMO, Yes, just start low and work up as always.
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