Basically, it's a device to throw darts, not shoot stuff at high power. Not a quick and dirty route to a serious big bore.
http://www.midwayusa.com/product/159921/speer-plastic-cases-44-caliber-box-of-50
Heres the Plastic 44 shells.Quotehttp://www.midwayusa.com/product/159921/speer-plastic-cases-44-caliber-box-of-50
I found a site that shows the dimensions of the trapmaster shells it shows that the outside diameter "OD" is .440 now I also found Speer Plastic Cases in 44 caliber would these work as trapmaster shells?