Question on Stu Miller's spine calculator

[Jock Whisky]

I have a question about this spine calculator with respect to footing.

I'm using 100 grain hit inserts that are 1.5 inches long. In the footing section I enter 0.6" for footing length and 40 grains for the weight. What do I do about the remaining 60 grains of insert weight?

[Ray Lyon]

I just use 100 grains for insert and no footing.