In a nutshell, it does, but you must remember it's a model, and so must be trued to actual firings. One of their selling features is you can spend a LOT of time prefecting a load without the program, or you can use the program to get you close to the optimum then spend much less time at the range and just fine tuning. I picked it up after a frustrating summer trying different combinations using methodologies such as ladder, modified ladder, etc (what a waste!). After a little modeling I built a load and was shooting .5 MOA right off the bat. Needless to say I was impressed.
You can download a demo at www.neconos.com
There are a few tips to know when using the program, one of the first things I found out is on average, slow powders make for poor accuracy.
Just to add, I also own a 300WM. Norma MRP models as the most accurate powder for this caliber, however there are others that come close. I went with Hodgdon H4350 'cause I hunt in hot and cold weather and want temperature stability.
Email me your barrel length and bullet type and I'll send you a couple of models for you to look at.
[ 01-02-2004: Message edited by: AlbertaBound ]