Why no such thing as +P .40 cal?

This is a discussion on Why no such thing as +P .40 cal? within the Defensive Ammunition & Ballistics forums, part of the Defensive Carry Discussions category; That I am aware of....+P's are made in .45 and 9mm... not sure about .380.. Why not .40cal? Is there something restricting a +p manufacture ...

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Thread: Why no such thing as +P .40 cal?

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    Member Array floridaguy911's Avatar
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    Question Why no such thing as +P .40 cal?

    That I am aware of....+P's are made in .45 and 9mm... not sure about .380.. Why not .40cal? Is there something restricting a +p manufacture of .40? Maybe the case is already as full as it can get with powder.. I dont know.. which is why i made this post.

    --added-- I did not post this because I am seeking out +P for myself, Just curious why some and not others.

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    VIP Member Array Redneck Repairs's Avatar
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    .40 is allready " +P " it came about to duplicate the lower " fbi " load for 10mm in a smaller package , in doing this they pretty maxed out the pressures that the cases /actions could safely handle .
    Make sure you get full value out of today , Do something worthwhile, because what you do today will cost you one day off the rest of your life .
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    Senior Member Array hsuCowboy98's Avatar
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    The .40 case is pretty much packed tight as is, and as RR said, almost topped out pressure wise..tha being said there are some pretty hot loads out there.
    Fear No Evil.

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    Maybe the 357 Sig qualifies as such. Just swap the barrel and PRESTO!
    Former Army Infantry Captain; 25 yrs as an NRA Certified Instructor; Avid practitioner of the martial art: KLIK-PAO.

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    VIP Member Array Redneck Repairs's Avatar
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    Lets not get a caliber war thread going , question about +P 40 was asked and answered LOL .
    Make sure you get full value out of today , Do something worthwhile, because what you do today will cost you one day off the rest of your life .
    We only begin to understand folks after we stop and think .

    Criminals are looking for victims, not opponents.

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    Senior Member Array hsuCowboy98's Avatar
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    Lets not get a caliber war thread going , question about +P 40 was asked and answered LOL

    Very true....theres too much of the caliber war stuff already.
    Fear No Evil.

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    Member Array floridaguy911's Avatar
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    Quick RE to EXsoldier. I bought a 357 Sig barrel last weekend for my G27, anxious to test it out.

    Thanks Redneck, and HSU for answering my question. Your knowledge is appreciated!

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    Distinguished Member Array dimmak's Avatar
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    As said above.....
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    Member Array dboutwell's Avatar
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    33,000 psi,,,,,,,,,,,,,,,,, that is a plus P

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    Member Array Tros's Avatar
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    Quote Originally Posted by Redneck Repairs View Post
    Lets not get a caliber war thread going , question about +P 40 was asked and answered LOL .
    Mwhahahaha
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    I think a lot fr pistols with loaded chamber indicators could not handle more chamber pressure as well.

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    VIP Member Array Blackeagle's Avatar
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    You've got to remember that the calibers that have +P and +P+ have been around for a long while. In fact, the 9mm Parabellum, .38 Special, and .45 ACP rounds are all over 100 years old. In the century since they've been developed, better metallurgy, machining, etc. have allowed stronger firearms that can withstand higher pressures. As Redneck said, the .40 S&W is already a very high pressure cartridge. It was designed that way from the start.

    As time goes on, firearm design and construction may continue to advance, allowing even higher pressures, so in a hundred years, there may be a .40 +P round. Of course, by that time you'll also have 9mm ++P++.

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    Senior Member Array Musketeer's Avatar
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    Black Eagle and others have it right. The FBI downloaded the 10mm because they decided what they needed (after much research and money spent) was not what the agents who were not practicing or with small hands (due to gun selection) could handle.

    S&W then said if the brass were shorter the gun could be made smaller so they cut the brass down to just enough to cover the 10mm -P load the FBI came up with.

    Perhaps in the future if poweder becomes more powerfull and less is used in the case you might see the advent of a +P 40, but not until then.

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    Distinguished Member Array randytulsa2's Avatar
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    I was thinking the 10mm was a +P .40.

    And IIRC, the chamber pressures on .40 S&W are pretty stout as they are in standard loads. They may already put so much powder in the case they can barely seat the bullets safely.

    OTOH, it may be just a matter of time before someone does introduce a .40 S. & W. +P or +P+ (complete with a list of guns that are safe weapons out of which to shoot it).

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    Buffalo Bore makes a couple +P .40 S&W loads.

    http://www.buffalobore.com/ammunition/default.htm#40sw

    For use in firearms with fully supported chambers.

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