Mike the slow twist with the heavy load is better, it will group better at long range because with a heavy load the ball is moving faster and so there is less time for wind and gravity to move it around. Best for deer at long range, well my opinion is base on having tried all common caliber at 177 yds working on the Hawken and Mountain man shoots at friendship using a Hawken with a 1-89 twist and 130 gr of RS I got a 19 inch string. considering two of the shots were off hand I thought that was about as good as I could do. I have taken two deer and one bear [over 300#] all one shot kills at over 177yds and none of them went 20 yds after being hit. A lot of people sell a PRB short. I do not use a 50 at that range or a 58 the 50 is affected to much by the wind and the 58 has a rainbow trajectory that don't even compare to the 54. They are all good guns at the range they work best at but with PRB only the 54 shines at over 150yds. Of course this is all my opinion but years of long rage competition and 60 years of hunting are what formed that opinion. Lee

Good stuff...thanks all!