The firearm design, weight, balance, materials and how it fits you are all factors in felt recoil.
Chamber pressure is one factor in a snappy recoil. Chamber pressure is more noticeable in handguns. Try shooting and comparing the felt recoil in the same magnum firearm of the following using the same bullet weight.
.38 Special vs. .357 Mag fired in the same .357 mag revolver
.44 Special vs. .44 Mag fired in the same .44 mag revolver
Then look at the difference in the chamber pressures.
You will need different firearms for the following, unless you have a model with interchangeable barrels. Use the same model if possible. Compare full power non+P loads with the same bullet weight in the following.
.45 ACP vs. .40 S&W
Chamber pressure is not the only factor, but it is one of the factors.