I have the Predator model in the creedmoor and as others have stated the throat is not that long. I played with the berger 130s before settling on the 140 amax load that was too good to not use as a primary load. I am still playing with the 130s when I find time to get to the range. I am using H4350 in both loads, with the 43.5gr was getting an average of 2897 out of the 24" barrel with no signs of pressure. I have a couple more charges loaded for next range trip. I will say that the 129sst superformance factory load shot good at 100yds, under 3/4", with 5 shots reading 3049, 3055, 3054, 3055, 3057. I find that hard to believe myself, but that was the reading. The group opened up at 200 yds or I would have bought a lot more of it! I have read of people getting good speeds even out of the 20" lightweight hunter.