WOW.. that is strange. If your using the same charge, patch, and method of loading and swabbing you would think they would shoot the same way.

Have you ever noticed that the barrel gets hot? I am not saying that is the cause, but I have one rifle that if you shoot and do not give the barrel a chance to cool down between shots, it will sometimes start to spread the group on you.

Other then that the .32 caliber Cherokee was known to be an excellent shooter. I could see this happening if you were not swabbing good between shots because the .32 caliber being a smaller bore has a tendency to fowl up much faster then the larger bore barrels.

I hope you figure this out. It will be interesting to learn the reason.