Not sure if its the same barrel that's on my Priest2 177 but just found out it seems to shoot the 16gr really well. I have only concentrated on slugs with this rifle so didn't know what it could do with pellets. I had just a few 16gr left that I've had for over a year as nothing I had would shoot them well. I decided to give them a shot at 30yards. Not sure the speed but just finished shooting 13gr slugs at 930fps. Shot a 5 shot group at 30yards dam near the size of one pellet hole. Of course had no more pellets to retest this. Needless to say I pulled my Priest off the classifieds and ordered 2 tins of 16gr JSB's.