In talking with Lee Jurras about mine he informed me that each and every one was an individual unto itself. So developing loads was an adventure if you were solely trying to use factory load data.
Using Lees recommendation I exceeded Hornady load data by 3-4grs just to get the gun to function. His suggestion was load one round with an empty mag until you came to a load that would lock the gun open after firing. That would be your base line.
Mine was very accurate, but I became worried about something irreplaceable being broken and winding up with an expensive paperweight, so after taking some game with it I sold it.
NRA Endowment mbr.
U.S. Practical rifle/shotgun national team