Originally Posted by PghJim
One of the interesting things about the 357 sig HST is that the exit hole on the first jug and the entrance hole on the second jug indicated a bullet diameter significantly bigger than the final expansion size. If you bend up the pedals the bullet would be over an inch in diameter. Evidently it completed its expansion in the second jug because the exit hole on the second jug was smaller and the same size as the entrance and exit holes on the third jug. One thing we do not always think about when we look at final expansion is that for a part of the bullets trip it expanded up to, and maybe over, an inch and then bent back to 0.61"
That is an interesting observation. I think you make a good point that the final expansion can be misleading in some cases.
BTW, you mentioned the CorBon 125 gr JHP in your first post. Have you done a similar test with it previously? If so, how did it compare to the results you saw from the .357 SIG HST?