It's been two decades since I last did any physics calculations, so I'm hoping somebody can help me with the following thing I'm trying to work out. I tried using some online physics calculators, but can't get it right.

In the athletics (track and field) event shot put, some rule changes have made the shot 9 grams heavier than it used to be, but without any changes to records etc. The question therefore arises - what difference does 9 grams really make?

The following parameters can be used. The "new" shot, that weighs 7265 grams, is used. It is released from a height of 2,20 meters above a perfectly flat competition area at an angle of 40 degrees from horizontal and hits the ground 20.00 meters from the point of release. If everything stays exactly the same, but the "old" shot, that weighs 7256 grams, is used, how far will it travel before hitting the ground? Wind resistance can be ignored.

For in case it's needed, here are some of my amateur ideas about how this calculation should be done.

1) The speed of the shot in the direction of movement at release should be calculated.

2) The amount of force needed to achieve that speed needs to be calculated (would the distance over which the force is applied make a difference? If it does, I can supply some typical values)

3) The speed at release if the same force was applied to the lighter shot must be calculated.

4) The distance of travel of the lighter shot must be calculated.

Thanks!