Re: GPR questions
The barrel can be cut pretty easily with hand tools IF you follow the instructions in Chuck Dixon's book on Building PA Longrifles. I've done a few this way and it's not difficult. The only problem may be dealing with the bluing. If you cut it to 28 or 29", you might reach a nice compromise.
I've hunted with flintlocks with barrels from 26" to 42". Long is better for sitting, shorter is better for walking/driving. I think anything below 26" is too short. This is a good excuse to have another rifle- 1 short, and 1 long.
As always, your mileage may vary.....