For all you techies out there, I' m wondering how much (typically) arrow weight would affect the " advertised" IBO speed of a bow.

For example, if a bow is advertised at 300 fps IBO, using a 350 grain arrow, what would be speed be for an arrow that weighs slightly more than IBO?

How much speed do you lose for every 5 grains of weight above IBO?

Again, just looking for general/ballpark figures.

Thanks,

Jim