FREE download and it works.
You can start out using the loading data from Western.
http://www.blackhorn209.com/wp-conte...loaderdata.pdf
IIRC the bullets BC is .240
http://strelok-ballistic-calculator.soft112.com/
The Google Play store has it FREE for smart phones.
https://play.google.com/store/apps/d...orisov.strelok