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Snowman50

125 or 147gr. for USPSA

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I started out with 124s, did 147s for a while, and have settled on 135-138gr.  There's not quite as much load data, but it's a good compromise in bullet price and slide speed.

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On 7/28/2020 at 3:17 PM, zzt said:

Until you have actually tested this, you are guessing.

 

Any test data would be interesting.

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The bullet nose shape is a critical factor here. Flat noses will definitely put down poppers better than round noses

 

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7 hours ago, jim vaughan said:

The bullet nose shape is a critical factor here. Flat noses will definitely put down poppers better than round noses

 

Based on theory or based on testing and data?

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On 7/28/2020 at 1:51 PM, Nc1911 said:

 I have some 115gr ammo that runs ~130PF, and it sometimes fails to knock down steel.
 

 

The power factor is power factor regardless of bullet weight.
115 grain at 130 power factor will knock down steel just as good as a 147 grain with the same power factor.  
 

  

 

On 7/28/2020 at 2:49 PM, Nc1911 said:

I agree that the hardness will effect how much energy is transferred into the steel, but mass x velocity produces the same amount of energy.

 

On 7/28/2020 at 3:04 PM, GearHead36 said:

Energy = K x mass x velocity^2. K is a constant. At the same PF, the lighter bullet will have more muzzle energy.

LOL,,, here is a tidbit. Foot lbs of energy formula is one great big lie as it pertains to bullets hitting things.
As folks above tried to tell you about steel,, as pretty much any big game hunter, especially ones with handgun and blackpowder experience will tell you, end if you really really still dont get it , bring your high foot lb of energy ammo to a bowling pin match.

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