Here is the advice I gave to a friend who followed this, to harvest his buck on rattling.

You have to watch the wind. Your buck always goes in headwind, put a Purine buck scent pad to hide.

Start with:

A) 2 minutes rattling moderate

5 minutes break

B) 2 minutes moderate rattling with 3 to 4 grunts

5 minutes break

C) 2 minutes rattling more aggressive with 7 to 8 grunts

5 minutes break

D) 2 minutes aggressive rattling

Grunt 10-15 times

5 minutes break

Repeat 3 x for a total of 7 sessions, which gives 49 minutes

Make sure to be covered for rattling, because often they are there, advance very slowly and look where is the fight or he goes out to the race towards the sound