Grip pressure is a personal thing. Some people are stronger than others and therefore some people need to hold the club tighter than others.
My own feelings are that on a scale of 1-10 (1 softest-10 tightest) I know I play my best when at 7 for full swing and 5 or below for the shots inside 100 yards.
I have know very strong men who have needed to feel like they were holding the club at 4 on the scale to be able to allow the club to swing without throttling it.
The only real way to find what’s best for your game is to test and experiment with all the possibilities.
We use the above test as a way to measure the grip pressure and then be able to go back to it during play.
So get out there and do this test, find out what works best for you for different shots and take some notes. Test this out a number of times and then you will have something to check when on the course.
One of the first things that happens when you get nervous is your grip pressure increases. Not that you know what pressure you want for each shot, you now have a way of getting back your feel when playing in competition.
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Filmed at Troon.