I recieved my copy of Bryan Litz's book yesterday. After reading the first five chapters last night I can say that it is a very well written and imformative book. This is one that I'll have to read several times to absorb all of the info. I also compared the ballistic solver program that comes with the book to the RSI program. The Ballistic solver showed a bullet trajectory of - 426.83 inches and the RSI program showed one of -426.60 inches at 1000 yds. I used identical information for the imputs.When computed with 25 yd increments the two programs never varied more than .23 inches and over half of the results agreed exactly. Thanks for all of the work Brian.