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Old December 31, 2012, 07:14 PM   #1
Kirkpatrick
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+p head stamp for less than max loads

I'm reloading .40 s&w and .45 acp. I've been buying once fired brass, when loading for regular rounds, below max load, does it make a difference if the head stamp is +p?
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Old December 31, 2012, 08:46 PM   #2
Marco Califo
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No.

No. +P on brass only indicates that the initial loading was likely +P. Once it has been fired, they are all the same.
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Old December 31, 2012, 08:59 PM   #3
Misssissippi Dave
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No.
No. +P on brass only indicates that the initial loading was likely +P. Once it has been fired, they are all the same.
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Old December 31, 2012, 10:36 PM   #4
Sport45
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I didn't know there was a .40s&w +P. I certainly wouldn't put anything labeled as such in one of my guns. Where did you get the brass?

It's probably just standard brass stamped +P for marketing. Weigh a few and see how they compare to the rest of your .40 brass. If they are much heavier (thicker web) I wouldn't use them for anything over mid-range loads.

I just re-read and caught the .45acp part. If it's .45acp brass that's +P then those probably do have thicker webs. But that cartridge runs at such a low pressure anyway I don't segregate them. It would probably make a difference to bullseye shooters.
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Old December 31, 2012, 11:41 PM   #5
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There is no SAAMI standard for 40 S&W +P but that hasn't stopped ammo from being sold under that term. There is however 45acp +P brass, ammo and an official SAAMI pressure ceiling for it.

I always found it ironic when people are reluctant to use +P brass for anything but reduced power load, given that it is either the exact same as normal brass or reinforced to handle extra pressure. You would have to contact the manufacturer of the brass to know which it is as SAAMI only specifies external dimensions.
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Old January 1, 2013, 09:09 AM   #6
m&p45acp10+1
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I did a water weight test with some +p brass, and regular brass from the same maker. They were so close to the same I could care less if it says +++++++++ a global thermo nuclear mega uber ICBM warhead.


They load and shoot just the same.
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Old January 1, 2013, 10:32 AM   #7
Sport45
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Starline makes their 9mm and .38spl +P brass the same as normal with only the headstamp changing.

Quote:
Originally Posted by Starline Web Page
38+P
1.140 - 1.150 O.A.L.
38 SPL+P has no difference from the standard 38 SPL, other than headstamp designation for load segregation. This is due to the fact that our standard case design will handle +P pressures with no problems.

They say their .45acp brass is made with a thicker web at the base.

Quote:
45 ACP+P, 45 Automatic+P
0.892 - 0.897 O.A.L.
The 45 Auto+P is a strengthened version of the 45 Auto with the same external dimensions. A thicker web and heavier sidewall at base strengthens the case in potentially unsupported areas. This case has approximately 2 grains less internal water capacity than the standard 45 Auto.
Starline Order Page

YMMV
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