One must be VERY aware of IN-Bore-Drag
A Gilded Slug ( electro plated ) is one thing being its resistance to taking the compressive forces of barrels rifling in no more than a bare lead slug.
A Jacketed slug ( Actual metal encasement ) is going to need a LOT more energy to overcome the rifling biting into it for it to pass down barrel.
As such you will being loosing much efficiency and shooting slower.
Moral being ... A jacketed slug may STICK in bore and not make it out unless rifle shot from has some very serious power !!!
JMO on said subject