Gary - I had the same problem with my 10/17 blowing cases.
The first case blew over Easter with my son shooting..he got a nice blast of powder in his face & I got dirty shorts....
Now the gun (with last years ammo) doesn't cycle reliably - usualliy not resetting the hammer.
Beware 17 HM2 from lot # K05K25 - about 50% of the ammo I tested blew the rim out or split the case - using the same 10/17M2.
It seemed to work OK in my 77/17.
Always wear saftey glasses........
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