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Old 08-30-2020, 07:18 AM
Ray Ray is online now
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Default S&W 1917 and .45 ACP P+

I Bought yesterday some .45 ACP P+ for defensive situations. Is the use of a few rounds , say a cylinder full, liable to cause serious damage to my brazilian?
How the pressure ( CUP) of both loads, conventional and P+ compare ?
Thanks, Regards, Ray
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Old 08-30-2020, 01:28 PM
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SAAMI standards for the 2 cartridges are:

.45 ACP - 21,000 PSI
.45 ACP +P - 23,000 PSI

There's less than 10% difference between the two, so with the caveat that I know nothing about you particular revolver, it is probably safe. You mentioned CUP, but SAAMI doesn't list a CUP standard for the +P load.
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Old 08-30-2020, 02:35 PM
stansdds stansdds is offline
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Just like firing 38 Special +P in S&W 38 Special revolvers that pre-date the model number system, it will not blow up your revolver, but it will accelerate wear and tear. I would approach it the same way as with 38 Special revolvers, practice with standard pressure ammo, finish practice with one cylinder full of +P for sight-in and familiarization.

With modern bullets like Federal's HST, Speer's Gold Dot, Remington's Golden Saber, and Winchester's Ranger T, the extra velocity of +P ammo is not required for adequate and reliable expansion. With modern bullets, +P often causes faster expansion, but at the expense of reduced penetration.
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Old 08-30-2020, 03:18 PM
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Quote:
Originally Posted by stansdds View Post
Just like firing 38 Special +P in S&W 38 Special revolvers that pre-date the model number system, it will not blow up your revolver, but it will accelerate wear and tear. I would approach it the same way as with 38 Special revolvers, practice with standard pressure ammo, finish practice with one cylinder full of +P for sight-in and familiarization.

With modern bullets like Federal's HST, Speer's Gold Dot, Remington's Golden Saber, and Winchester's Ranger T, the extra velocity of +P ammo is not required for adequate and reliable expansion. With modern bullets, +P often causes faster expansion, but at the expense of reduced penetration.
In my younger days I used a lot of +P and even +P+ type loads in a number of 1917s and even a shaved S&W 2nd model with british markings. I didn't care. They were cheap and not regarded as collectible and I regarded them as a "poor mans magnum". I no longer do that. I also don't think that a few +P for familiarization and a cylinder full at the end of a practice session will hurt your extremely fine revolver. and for defense they will be great.
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Last edited by ddixie884; 08-30-2020 at 03:19 PM.
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Old 08-30-2020, 06:06 PM
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Thanks to all for the answers, regards, Ray
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Old 08-30-2020, 06:21 PM
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I wouldn't subject my 1917, 37 or my 1950 model to +p .45s. There are to many guns out there more capable of handing those loads.
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Old 08-30-2020, 07:02 PM
rockquarry rockquarry is online now
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There is little practical advantage in using +P ammo in anything as opposed to using standard pressure loads, though the gunfighting theorists might disagree. Learn to shoot well; far more important than +P.

Were the 1917 revolvers even heat-treated? I don't know, but perhaps another good reason not to use +P in a gun that's a hundred years old.
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Old 08-30-2020, 07:09 PM
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Originally Posted by andy52 View Post
I wouldn't subject my 1917, 37 or my 1950 model to +p .45s. There are to many guns out there more capable of handing those loads.
If I had a handful of +P ammo and a 1917 I'd use it as an excuse to go out & buy another ACP revolver.
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Old 08-30-2020, 10:37 PM
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What is the minimum thickness of the cylinder, at the notch? About 0.023 inch? How much pressure do you want against that thin piece of steel?
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Old 08-31-2020, 06:39 AM
StrawHat StrawHat is offline
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Quote:
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...Were the 1917 revolvers even heat-treated? I don't know, but perhaps another good reason not to use +P in a gun that's a hundred years old...
Yes, the military required the cylinders of the 1917s to be heat treated. The first of the S&W revolvers to be heated treated. After that, it was phased in to all of the line I believe.

As for firing +P in a 1917? I have between several and many ACP revolvers. Because I have some modern ones in the group I use those for heavier loads. The 1917s and even the 1950 get hardball or handloaded equivalents. Just my choice. I do not expect expansion at handgun velocities and prefer a larger meplat to increwse effectiveness.


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