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sabot does a real number on accuracy as far as I know
 
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Discussion Starter · #12 ·
Nice caliber, but no match for my "Franken-fifty" !! :D

I know this is a joke.

But here is the reason why this kind of radical cartridge design won't work;

Assume peak pressure is held to 65,000 lb/in2 (to keep from yielding the chamber wall).
Also assuming that maximum velocity is our goal then acceleration inside the barrel needs to be maximized.
Let's also ignore pesky little details like stiction, friction and stuff like that.

A .224 in diameter bullet has an area of: .0394 in2 and a Mass of 3.56 grams.

Force = Pressure X Area
Force = 65,000 lb/in2 X .0394 in2
Force = 2,561 lb (1161.7 kilograms)

Since:

Acceleration = Force/Mass
Acceleration = 1161.7 kg/3.56 g
Acceleration = 326,306 m/sec/sec

Let's but that .224 bullet inside a sabot that has a diameter of .50 inches and the whole launch weight doubles (Sabot = 3.56 grams "parasitic weight", Bullet = 3.56 grams).

Force = 12,762 pounds
Mass = 7.12 grams
Acceleration = 813,026 m/sec/sec

That's about 2.5X faster launching a heaver mass hence the use of the Sabot (pronounced Say-Bow).
 

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I have to wonder about plastic fouling like muzzle loaders do with sabots. IIRC there is/was a load for 30-30 win like this.
 

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On their website, the targets they showed that were shot with this round were getting pretty big groups, about 10cm for every 100m, or about 4 MOA. Not really an accurate round out of any of the rifles it was fired from, and that's just what they're showing.

To me, personally, it's just another necked-down wildcat varminting cartridge with some fancy bullets, nothing more.
 
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