You've still got snow? Coalmont must be interior B.C., then....
I've taken more than one grouse with a jacketed soft-point 150 gr. at 2680 fps, and contrary to popular belief, it doesn't decapitate them, or blow them up- not enough mass on a grouse to trigger that kind of expansion. What I get is .30 caliber holes- in and out- even on the head shots....
Edit: What tears them up badly is the CCI Stinger. I did that once, quite by accident, and I'll never make that error again...
Regards,
Doc Sharptail