Hornady and TC
 

I have been using the 250g TC shockwave out of my Omega. Recently, I was able to pick up Hornady SST bullets at a lesser cost.
The Hornady's were grouping in the same spot.
The bullets look identical other then the color of the plastic tip.

Is it possible that the Hornady bullets and the TC shockwave are made by the same company?

They are both made by Hornady.

They are the same bullet but a different sabot. Sometimes they do not load the same. For instance the shockwaves load fine in my Black Diamond. But the SST's are near impossible.

I noticed the same. The TC's load fine but the Hornady's are much tougher to get down the barrel.
Interestingly enough though, they have the same impact point for me using 90g of loose Pyrodex