I don't know where you are but since you are trying 777 I suspect you are looking for a cleaner powder. I would suggest you try some American Pioneer Powder in the fffg form or better yet if you can find it some Black Mag'3 which shoots great in my stainless Omega .50. These two powders seem to shoot best with bullets in the 300gr. or heavier and with powder in the 80-120gr. range. I would not go over 120gr. with Black Mag'3 since 100gr. loads under a 300gr. bullet was producing velocity of 2004fps. in my Omega. By the way the recoil was less than the recoil I get with 777 that only produces 1650fps.