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Malcolm's K-Hornet likes the sierra 55gr SMP projectiles. They shoot well - he uses his for home killing sheep (and previously deer as well) mostly.

I started with Speer 52gr HPs in my K-Hornet -...

Metal fatigue related? Caused a crack that propagated with continued use until the catastrophic failure. Was it new or had it done much shooting?
A circumferential crack would not be created by...

Interesting failure - looks like a brittle failure of the metal.

No elongation or deformity? No bulge?

Even the failure orientation looks interesting. Internal pressure within a tube will...