TC Breakqway sabots,used them for years,just gave about 600 to an old friend,like many things they have good and bad points.Good if you add extre borebutter to the felt wad you can get a lot of shots before having to clean,they tend to load easy compared to the new type. Bad, the loads and powder you can use are limited;they won't handle heavy loads about 100gr volium measure much more and the accuracy is gone.I would not try to use them with APP,Gold or Pinnicle powder as they are very senitive to oil or grease.Hope this helps Lee.