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Loads for Pre-Heat Treat .38 Special Versus .32/20 M&Ps

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.455_Hunter

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May 25, 2005
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Colorado Front Range
Greetings,

Lets say for the sake of argument that you have two Smith and Wesson M&P revolvers, both with the 5” barrels, produced in 1910 (non-heat treated cylinders) , and in good firing condition. One is chambered in .38 special, the other in .32/20. According to all sources, it is perfectly OK to shoot standard velocity factory .38 Specials in the .38 Special M&P, such as the 158 LRN at nominal 755 fps for 200 fpe. Indeed, the gentleman at Gunblast.com had no concerns about loading his 1900 production 6” M&P with a 158 gr. LWC handload launching at 860 fps for 260 fpe.

It seems to me that .32/20 version of the same gun should be able handle, without any issues, a load firing a 115gr. LFN at 885 fps for the same 200 fpe. However, everybody seems to start wringing their hands about any .32/20 loads that even approaches 150 fpe, let alone 200 fpe in these guns. I have even seen folks worrying about shooting current factory .32/20 (Rem and Win) loads in their guns. :confused: These wimpy factory loads usually hit 750-780 fps out of revolvers- squarely in .32 S&W Long county!

Why is it that as soon as somebody talks about loading the .32/20 in these guns that they turn into weak elderly dinosaurs that can barely handle a 100 gr. slug at 750 fps, but the .38 Special version (which has thinner cylinder walls) can shoot all day long with a load that has nearly 2X the energy?

For reference, the black powder loading of the .32/20 was 20 grains and the .38 special was 21 grains. Big difference! :rolleyes:

Thanks for your input. :)

Hunter
 
I'm loading 4.5 Unique over a 114gr. cast bullet in an old Colt SAA.
That's about 1,000 FPS.
It's a fairly mild load as 32-20's go.

Should work just as well in an old M&P.

In 1967, the factory handgun load was a 100 at 1,030 in a 6" barrel.

We been lawyered down since then though!

rcmodel
 
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