The same protocol is used in the marketing of compound bows. I have never come close to advertised FPS using the minimum required real world arrow weight, hunting broad head , draw length when using a chronograph .
Simple way to solve this debacle is to load up the new round with standard barrel length , reasonable pressures, chrono and post results and accuracy of this new round. Be even better if it was windy or really hot or cold at the test range.
The guys on here that know their stuff do this and post results.
