I have not tried the 300gr. T/C Shockwaves/Hornady SST's, but I have shot a lot of 250gr. Shockwaves and SST's out of my Triumph and Black Diamond and love them. I have never had a problem with pass-thru shooting these bullets.
A friend gave me a package of 300gr. Shockwaves the other day (he got a 45 cal. barrel for his Encore, so he can no longer use them). I plan on trying them out sometime this year just to see what kind of difference in accuracy I get out of them.