I like Parker shotguns too, Mike!  This Hellis gun has 2 1/2" chambers, ejectors, 28" barrels and weighs about 6 1/2 lbs.   A bit heavy for a Grouse gun, at least for me. What do your Parker VH 12 bores weigh? 
Forgot to answer your question Buzz:
The two VH12/32s weigh about 7-3/4 pounds, both 2 frames.  Right or wrong I shoot 2-3/4" factory loads in them. 1-1/8oz, 3DE
The VH12/30s weigh 7-1/2 pounds.  All 2 frames. Factory 2-3/4" 
DH12/28" Damascus 6-3/4 pounds, 1 frame.  Low pressure reloads, 1-1/8oz
VH16/28", O Frame  - 5-3/4 pounds.  Factory 2-3/4" 1oz, 2-1/2DE.
VHE16/26", O Frame - 5-3/4 pounds, factory 2-3/4" 1oz, 2-1/2DE.
BHE16/26", O frame, steel barreled - 5-3/4 pounds, factory 2-3/4" 1oz, 2-1/2DE.
VH16/28, 1 Frame - 6-1/2 pounds, factory 2-3/4" 1oz, 2-1/2DE.
AHE20/26, O Frame steel barreled, 5-3/4 pounds, factory 2-3/4" 7/8oz 1200fps loads
Also I have reloaded 1-1/4 ounce pheasant loads for the steel barreled 12 ga Parkers.  
I am shooting factory shells in most of these guns that are of a higher pressure than the factory loads concurrent with the guns' manufacture.  I have measured wall thicknesses of barrels and chambers and am satisfied.  If I blow my fingers off it will be my fault.
Buzz do you think any of my sixteens are light enough to make grouse guns?  I have never been ruffed grouse hunting but the sixteen 1oz 2-1/2DE load was plenty for the Sharptails in Montana.