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Old 02-17-2020, 07:48 PM   #1
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Kimber 9mm Stainless LW

I will be bringing up questions as they come up. Question 1 is going to cause all kinds of negative feedback but here goes, if I am going to load with Underwood +p+ 115 grain JHP And I am going to test it only for extreme circumstances and not repeated use, should I upgrade the recoil spring to higher than 12 lbs. what spring would you recommend. Also, has anyone tried +p+ ammo.
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Old 02-17-2020, 07:57 PM   #2
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I can't think of any good reason to use +p+ ammo.

But to answer your question, for just a few test rounds probably not needed.
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Old 02-17-2020, 08:15 PM   #3
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I will test a box of it after cleaning it first. Once I am satisfied of function, I will clean an only carry for security. From time to time I will re-test a box (20 rounds) per test.
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Old 02-17-2020, 08:23 PM   #4
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Lots of reasons why your "plan" is a bad idea. But it's your pistol.
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Old 02-18-2020, 05:45 AM   #5
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I have to agree with Arland, that's a bad idea. Clean and take the time to break the gun in properly with standard FMJ ammo. I'd never carry a gun that hasn't been broken in and proven itself to be reliable. Once you've done that then you can test fire, load and carry +P ammo.
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Old 02-18-2020, 05:56 AM   #6
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Somebody gave me a box of top shelf +P+ about fifteen years ago. I don't know what to do with it.
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Old 02-18-2020, 08:51 AM   #7
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Chuck he's talking about using +p+ ammo.

I've not seen any pistol manufacture say +P+ ammo was ok to use?
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Old 02-18-2020, 09:24 AM   #8
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I mentioned using +P, not +P+ ammo, there is a difference. Years back Kimbers Owners Manual used to say that the occasional use of +P was OK but didn't recommended the steady use of it. The current copy of the owners manual fails to mention +P ammo but does say not to use +P+ ammo.

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
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Old 02-18-2020, 10:09 AM   #9
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3Gun: Honestly, I've been carrying and shooting the 1911 for over 50 years. In that time I had the unpleasant occasion to actually use my sidearm twice in combat. From that experience, using issue ball ammunition in my .45, I learned that it did the job quite well.

Now with the onslaught of new SD ammo from all the major manufacturers, why in h3ll would you want to subject your pistol to overpressure loads, when the standard velocity SD loads now have been proven to "do the job" quite handsomely, and do it well.

I've still got some boxes of Gold Dot marked "Law Enforcement Only" ammo that is 230gr +P. It's all been boxed up in a .50 cal can for years. Why? The real question is why would I want to pound my pet 1911's with the stuff?

Think about what you're putting in your gun and forget about stronger recoil springs. You especially do NOT want to use +P ammo in an alloy-framed gun for obvious reasons.
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Old 02-18-2020, 02:22 PM   #10
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I have used a good bit of +P+ ammo in the Underwood flavor, but never in a 1911. I did run some through a Sig P938, which resulted in the guide rod snapping off at the threads and getting launched downrange like a javelin, never to be seen again.

While I certainly understand the appeal of +P+ ammo in some applications, with the 5" barrel on your alloy framed 1911 I do not see the point.

I do believe the gun would be fine IF you upgraded to Wolff 38 Super recoil springs. To function with practice ammo though you would probably have to use 124 NATO stuff at least though.
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