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Author Topic: Tell me about the 7mm SuperMag....  (Read 1834 times)

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Offline PJ

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Tell me about the 7mm SuperMag....
« on: November 23, 2002, 05:18:37 PM »
What is the  parent case ?
What velocity can you get from a 10" barrel ?
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Offline Robert

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It's not in my new book P.J.
« Reply #1 on: November 23, 2002, 07:30:11 PM »
Actually, my new book is a few years old. 2000 edition.
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Offline IronMonkey

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its from 357 max case
« Reply #2 on: November 24, 2002, 04:26:56 AM »
It is a 357 max case with a new neck formed.  If I recall correctly you just run it through the 7 tcu sizing die or something.  Velocities should be about the same as the 7 tcu.  For more info I would check with someone like accurate arms.  They have always been helpful with information seeking.   :grin:
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Offline IKE

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Tell me about the 7mm SuperMag....
« Reply #3 on: November 24, 2002, 04:37:07 AM »
The 7SM is a 357 Maximum case necked down to 7mm and according to Sierra you can substitute 7TCU data for the 7SM......just think of the 7SM as a short necked 7TCU.

I've got a 14" factory TC Contender barrel in 7SM and really like it.....it 's a real tack driver.

I'm loading; Winch. 357 Max cases....WSR primers....Sierra #1900 120gr bullets....30.5grs of BLC-2....OAL 2.483.
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Offline PJ

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Tell me about the 7mm SuperMag....
« Reply #4 on: November 24, 2002, 06:19:30 AM »
Can you tell me if I can use 7 tcu dies or do I need 7sm dies ?
Is the 7sm easy to form and load ?
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Offline Robert

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Monkey, I have Accurrate's new book, isnt in there...
« Reply #5 on: November 24, 2002, 07:05:07 AM »
They might have some data that isnt published though.  www.accuratepowder.com
or 1-800-416-3006.  they have always been real helpfull whenever I have called on the phone.  They love their work there, and love to talk about it.
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Offline IKE

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7 SM
« Reply #6 on: November 24, 2002, 11:18:14 AM »
PJ,

  You will need to get a set of 7SM dies, mine are Redding...... 7TCU dies won't work.

The 7SM is no more difficult to load for than the 7TCU......piece of cake.
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Offline PJ

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Tell me about the 7mm SuperMag....
« Reply #7 on: November 24, 2002, 01:22:11 PM »
Thank's
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