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This whole caliber comparison is wrong. It's the pistol that makes the recoil.
If you are comparing it in nearly identical pistols, like the glock 19 and 23, then it is relevant. The Glock 22 and 21, for instance, are also so similar that the caliber comparison makes sense.
That's fine. Compared to 9mm in the same gun, it has more recoil. What's a "snap" vs a "pop" anyways? It's just a "bigger pop." No mystery, here. It's a hotter round.
G22 vs G21 is not too different, granted. So the round with equivalent energy in the lighter gun has sharper recoil. Still no mystery. If you could swap them, you'd probably see the same thing the other way around. Esp if you used similar energy ammunition.*
*I tried to google an energy comparison, which Ive seen data for before. Failing to find it, I calculated the energy for the hottest 180gr 40SW load on hogdon's reloading center. It has over 20% more energy than the hottest 185gr or 230gr 45ACP load on their site. It is over 100fps faster than the top 185gr 45ACP load. I know that's not a big sample, but I'm just making the point. 40SW is going to recoil more than 9mm for sure. It will also recoil more than 45, because it's the same energy (actually fairly higher energy with most common loads than standard pressure 45) in a smaller gun, period. People get wrapped up in the recoil, because they expect it to recoil less than .45. There's no reason to expect that. That's like complaining that 9mm is snappy compared to the "larger" 38 special. Of course it is.
**just for more kicks, I looked up the first common training ammo I could think of. Blazer. They list only one 45 ACP load. 230 grains. They list three 40 loads, from 155 to 180 grains. Ready? The 40 loads range from 9.5% to 30% more energy than the 45 load. This isn't hot-rod 40SW ammo. It's training ammo, for crying out loud. In fact, the weakest of the Blazer 40SW training rounds (the 180gr) has only 5% less energy than the hottest 230 gr 45ACP round listed on Hogdon's reloading center. To face the facts, the 40SW auto pistol is the titanium .357 snubbie of the auto world. The strongest round of the "big three" in the lightest package. (Actually, it outperforms .357 out of a short barrel!)
http://www.blazer-ammo.com/blazer_chart.aspx