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Thread: Is a 5" .45 R1 "rated" for +P?

  1. #1
    Join Date
    25th January 2012
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    Is a 5" .45 R1 "rated" for +P?

    I have a Remington R1 5" bbl .45 caliber. I am looking to upgrade to self-defense ammo and while reading an article the author stated "as long as your .45 is 'rated' for +P ammo".

    Is the Remington R1 .45 rated for +P and if so, how can I tell?

    I need to answer the same question for my Kimber, Pro Carry II 4" bbl .45's. but I assume, unless whoever answers this question can answer that one too, I need to post that in the Kimber section of this forum.

    I do not wish to do any damage to my firearms or void their warranties.

  2. #2
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    According to https://www.remington.com/support/help-center :Handguns:"Can I shoot + P ammunition in my Remington R1 1911?"
    No, the Remington R1 is chambered to standard SAMMI specifications and is not rated for +P ammunition.
    Likes (1) :
    Ric4509 (7th August 2018)


  3. #3
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    For your Kimber https://www.kimberamerica.com/media/...al_11-2015.pdf
    page 43
    Do not use +P+ ammunition because
    its pressures could exceed maximums established by the Sporting Arms and Ammunition Manufacturers’ Institute, Inc. of the United States (SAAMI) and result in an unsafe condition that may cause serious injury or property damage.

  4. #4
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    Thank you Pyrenean for the info on both pistols. I did note that Kimber said I should never use +P+ ammo but it does also say that the Kimbers will fire the +P ammo as long as it is not used often.

    Page 48 says - "Although this Kimber firearm is capable
    of functioning with +P ammunition in the
    appropriate caliber for the firearm,
    a steady diet of +P ammunition may affect
    the wear characteristics, shorten the
    life and endurance of your firearm, and
    necessitate more frequent maintenance and
    replacement of parts.
    Do not use +P+ ammunition."

    Thank you for finding the information for me. I only wanted to use the +P and not the +P+, and only for self-defense so, since I carry the Kimbers I will use the +P in them and not shoot it regularly. I will not use the +P in the Remington, for home defense, at all thanks to your Remington link.

  5. #5
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    The Owners Manuals of most of my pistols state that they recommend standard factory loads. Some state that while they are capable of +P, it is unwise to fire high volumes of high velocity rounds. None of my aluminum frames will ever have +P used in them.

  6. #6
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    Thank you tnhawk.

    I found an appropriate ammo that is not +P and have placed it in all of my .45's but your point is well taken.
    Likes (1) :
    Jim Watson (7th December 2018)


  7. #7
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    Good move.

    I think the emphasis on "rating" is overdone, a product of the legal staff, not the engineering department.
    +P is approximately a 10% overload in chamber pressure which typically gives about 10% greater energy.

    I do not think +P is warranted in .45 ACP, greater recoil outweighs the increased power.

    9mm +P, maybe, although I don't use it.

    .38 Special +P, definitely. My guns will just have to put up with the heavier load to, as Jeff Cooper said, get the old round up off its knees.

  8. #8
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    Well put Jim Watson.

    Thanks for your input. I have only one .38 and it is a WWII Victory Special and I wouldn't mess with any jacked up ammo in it.

    My other revolvers in that caliber range are .357's, so I'm sure they'd handle .38 +P. The only reason I might pick .38 +P is for my wife. She does not feel comfortable shooting the .357 Magnum ammo so maybe the +P would give her the extra oomph for personal protection should the need ever arise.

  9. #9
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    Quote Originally Posted by Jim Watson View Post
    .38 Special +P, definitely. My guns will just have to put up with the heavier load to, as Jeff Cooper said, get the old round up off its knees.
    .38 Special +P, or .38 Super +P?
    Hawkmoon
    On a good day, can hit the broad side of a barn ... from the inside

  10. #10
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    Quote Originally Posted by Hawkmoon View Post
    .38 Special +P, or .38 Super +P?
    Well, I SAID .38 Special +P. I keep some for use in any revolver I choose for self defense, even my Airweights.

    .38 Super +P is a SAAMI designation and labeling convention not on the same basis as other calibers.
    There is no .38 Super "standard pressure" the +P means it is heavier loaded than the 1900 era .38 Automatic. I understand they made the wording change around 1978.

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