The low gas pressure of the Rigby is not needed nowadays. The Brits used huge cases to lower pressure due to the instability of the powder they used, ie: Cordite.

Today's powders allow safe maximum loads in smaller cases that duplicate the reduced pressure loads of the huge Brit brass, using less powder and giving less recoil. The Taylor will duplicate Rigby factory ammo and therefore the end results will be the same, as long as the more heavily recoiling Rigby is as user friendly as a Taylor can be.

Today, using that huge case is a waste of money in action size and powder expenditure. Being a free-world in our areas allows us to use whatever we want - hence our acceptance of whatever turns your crank!!

Go for it.