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Larry,
The cadet is actuall a BP gun built in the smokless era. It has an action that will easily do 50K and probably over 60K. The trick is that the barrel, like a bolt gun provides the real pressure machine. The bolt of a cadet closes to a straiht in line lockup, inside a steel box. In other words you must drive the bolt through the rear of the steel box to open a gap in the front.
The one area in the configuration where the action shows its age is the firing pin hole. For high pressure cartridges the hole must be reduced to a moder diameter and the firing pin reduced in diameter. I made a small shouldered bushing for this purpose held in place with black locktite (5,000 PSI). As all of the pressure is to the rear all that is necessary is a slight shoulder to hold the bushing in place.
Once the bushing and reduced diameter pin is in place the Cadet will eat just about anything a 357 SM or 225 can put out.
Regards accuracy and performance:
357 SM with 16 inch barrel
180 gr Hornady Rifle bullet H-110 24.5 Gr 2,140 fps, slightly flattening primer, .70 group @ 100
200gr Remington RN 23.5 gr 2,040 fps no pressure signs .50 group @ 100
This is the 2nd gun which shoots identical to the first. But is a 357 SM only gun.
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