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The .40 generates more chamber pressure than the 9 mm but not by a lot around 2,000 psi IIRC. The earlier Glocks had some reported case head separations in some rounds in those guns because the chamber was unsupported. It was bullet setback in the .40 which caused pressure spikes in the round from loading and reloading. Glock redesigned the barrel on the gun so you don’t hear about the Kaboom like some of the earlier pistols. I personally don’t care for the round but I never thought it was as big a deal of control as some made it out to be. Back not too long ago you could pick up used.40 pistols pretty cheap. I think some police departments still use the 40. Some older history:
 

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This recoil table might help the OP:

Cartridge ([email protected])Pistol Wt. (lbs.)Recoil E. (ft. lbs.)Recoil V. (fps)
.25 ACP (50 at 800)0.750.98.7
.30 Carbine (110 at 1400)3.04.910.2
.32 ACP (71 at 910)1.01.710.5
.32 S&W Long (100 at 700)2.01.26.2
.32 H&R Mag. (100 at 1100)2.02.79.4
.32-20 Win. (100 at 1018)2.02.89.4
.380 ACP (90 at 1000)1.52.510.4
.380 ACP (95 at 900)0.65.424.2
9mm Makarov (95 at 1025)1.53.011.2
9x19 (115 at 1100)1.07.421.8
9x19 (115 at 1155)1.55.215.0
9x19 (115 at 1155)2.03.811.1
9x19 +P (115 at 1250)1.57.317.7
9x19 (124 at 1125)1.56.016.0
9x19 (124 at 1157)2.04.411.9
9x19 (147 at 1000)2.04.612.2
.38 Super (125 at 1250)2.254.911.9
.357 SIG (125 at 1350)1.757.416.6
.38 Spec. (125 at 850)1.05.618.9
.38 Spec. (130 at 819)2.252.28.0
.38 Spec. (130 at 950)2.253.19.5
.38 Spec. (140 at 825)2.252.78.8
.38 Spec. (148 HBWC at 738)2.252.17.8
.38 Spec. +P (110 at 1150)2.254.010.7
.38 Spec. +P (125 at 975)2.252.99.2
.38 Spec. +P (158 LHP at 900)2.254.311.1
.357 Mag. (110 at 1300)2.754.19.8
.357 Mag. (125 at 1209)1.758.918.1
.357 Mag. (125 at 1220)2.754.610.4
.357 Mag. (125 at 1450)2.757.213.0
.357 Mag. (140 at 1022)2.754.09.6
.357 Mag. (140 at 1323)2.757.913.6
.357 Mag. (158 at 925)2.754.09.7
.357 Mag. (158 at 1070)1.759.418.6
.357 Mag. (158 at 1250)2.758.714.3
.40 S&W (155 at 1200)1.510.621.3
.40 S&W (165 at 1080)1.59.319.9
.40 S&W (180 at 1027)1.510.421.2
10mm Auto (180 at 1295)2.2511.418.1
.41 Mag. (210 at 925)2.756.612.4
.41 Mag. (210 at 1300)2.7515.619.1
.44 Spec. (240 at 750)3.04.59.9
.44 Rem. Mag. (200 at 1000)3.06.712.0
.44 Rem. Mag. (200 at 1219)4.16.310.0
.44 Rem. Mag. (200 at 1295)4.17.210.6
.44 Rem. Mag. (200 at 1326)3.011.916
.44 Rem. Mag. (225 at 1239)3.012.416.3
.44 Rem. Mag. (240 at 1144)4.18.011.2
.44 Rem. Mag. (240 at 1172)4.18.411.5
.44 Rem. Mag. (240 at 1200)4.18.911.8
.44 Rem. Mag. (240 at 1271)4.110.012.5
.44 Rem. Mag. (240 at 1450)3.022.521.9
.44 Rem. Mag. (300 at 1187)3.022.622.0
.45 ACP (185 at 1000)2.257.714.8
.45 ACP (185 at 1047)2.56.813.2
.45 ACP (200 at 1010)2.57.613.9
.45 ACP (230 at 850)2.257.915.0
.45 ACP (230 at 916)2.57.513.9
.45 Colt (200 at 945)2.757.012.8
.45 Colt (200 at 1081)2.758.213.8
.45 Colt (230 at 936)2.757.913.6
.45 Colt (255 LRN at 860)2.758.213.8
.45 Colt (255 LFP at 914)2.7510.415.6
.45 Colt +P (250 at 1200)2.7517.020.0
.45 Colt +P (300 at 1150)2.7523.923.7
.45 Win. Mag. (260 at 1200)4.010.613.1
.454 Casull (260 at 1800)3.239.028.0
.454 Casull (300 at 1650)3.238.627.9
.460 S&W Mag. (250 at 1400)4.512.813.5
.460 S&W Mag. (260 at 1590)4.520.016.9
.460 S&W Mag. (300 at 1784)4.532.121.4
.475 Linebaugh (385 at 1525)3.052.233.5
.475 Linebaugh (400 at 1300)3.238.127.7
.480 Ruger (325 at 1330)3.323.121.2
.480 Ruger (325 at 1477)3.333.325.5
.50 Action Express (325 at 1294)3.229.324.3
.50 Action Express (325 at 1431)4.425.519.3
.500 Linebaugh (400 at 1550)3.062.336.6
.500 S&W Mag. (350 at 1446)4.525.219.0
.500
 

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What I hated about the .40 was its very snappy recoil. I tried a Gen 3 and Gen 4 Glock 23, and both torqued harshly in the hand and the triggerguard abraded the bottom of my trigger finger. I sold those and later tried a S&W 4006, but it was a tank by comparison and not practical as a carry gun. The only .40 I ever had that I liked was an H&K USPc, but the DA trigger on that one was virtually unusable so I ended up selling it as well. I'm now done with the .40 completely and probably won't ever get another one.
Those G23 guns were just Glock 19s with a .40 barrel in them. Lightweight guns for sure. I have shot them before even bought a used one some years ago and ended up trading it off. So much for Glock perfection. I do like the G30 and G21 variety though.
 
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