Truth?
I have a GM 54 mounted on an Investarms Renegade knock-off and it is a fine shooting barrel on that stock.
But,
It's all about fit of the stock to the individual.
A GPR doesn't fit me for HOOT! I can't fit it in the shoulder proper, the cheek is wrong,, those GPR are just plain uncomfortable for me.
Likewise, the T/C Hawken won't fit me,, I can shoulder just fine but those Hawkens are cheek slappers. If I spend a day shooting one of those I wake up the next morning feeling like I got in a bar fight with a south-paw!!
So, long story short both barrels make fine slow twist ball shooters when you spend the time working out the load details,, don't you worry about that 32" barrel. Some of my stiffest Rendezvous shootin competition is from GPR owners.
Ya need to find a GPR and handle it, shoulder it, shoot it if ya can,,