As Hammerslagger said, a more massive (and therefore heavier) gun will have more inertia to offset the force of firing. So 9mm in a long gun (example example
) would have a huge advantage. The use of steel instead of polymer also can increase the mass of a particular gun dramatically.
Comfort when firing a particular pistol will also make a big difference. For instance, I have a CZ75 that fits my hand like a glove. When shooting it, I feel about the same amount of recoil as I do when firing my wife's Walter P22 even though her gun shoots .22LR
. That P22 just doesn't fit my hand as well, and it's much lighter than the CZ, so to me
it feels very similar.
And I would not consider what seems to be your only pistol (based on you mentioning it in every post) as being particularly low-recoiling for 9mm. It's light and small. It's very good for what it's designed for, but reducing recoil is not what it's designed for.