Yeah, the plastic skirt is sort of a modern day equivalent to the Civil War "Minnie"
BY THE WAY.....there are some legal issues in SOME States. Some States may say a 50 caliber bore is the minimum for deer while others say a 50 caliber projectile. If you load a 50 caliber SABOT using a 45 caliber bullet- you are not using a 50 caliber projectile and there are stories that some hunters have gotten into trouble. In other words, in some situations the power belt being full bore is the best answer.
I had a CVA side lock that really liked the power belts, I later got an in-line that had the shove waves touching a lot of times at 100 yards. The thing is, you will spend a lot on camping fees, gas, etc. etc. while hunting. Use the best bullet possible for your particular rifle.