Just received their 158 gr SWC - It is truly a Sharpe H&G #51 bullet (bevel base version) as depicted in an original H&G catalog dated 1975. I believe that Stateline uses a Ballisti-cast mold which is a true copy of the H&G #51.
I have twenty loaded under 5.6 grs Power Pistol ready for testing next week - accuracy results to follow.
Stateline ordering process was very easy and I received the order in two days - real good company.