I shot the hornandy 250gr. SST out of my Austin & Halleck and they flew great. Patterned really well at 100 yards with 2 50gr. pyro. pellets. I modified my cleaning jag that is normally on my ramrod so when loading these bullets, the pressure is on the bullet rather than the plastic tip.
I shot a doe at 53 yards with the 250 SSt. She was standing broadside and the bullet blew completely through so I can' t tell you anything about expansion or weight retention of the bullet. I can tell you the blood trail was awesome. But since the bullet probably took the arteries off the heart, its likely any bullet traveling that path would' ve done the same.
Another thing I like is the cost. I was shooting devel sabots at a buck a pop and these are considerably less.
Dan