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Let me preface this by saying,different strokes for different folks,seems he never heard of conversion barrels.
Why I Shoot .40 Through My Unmodified 10mm GLOCK
By Jeremy S on June 26, 2015
10mm Auto came first. The FBI chose a watered-down loading — a 180 grain bullet at 975 fps instead of more like 1,300 fps — and a large-frame S&W pistol through which to shoot it. By the time the contract went through, Tom Campbell, S&W employee, had realized that the powder capacity of the 10mm’s 25.2 mm-long case simply wasn’t necessary to achieve this same velocity, and the .40 S&W with its 21.6 mm-long case was born. For all intents and purposes, .40 S&W is really “10mm Short & Weak.” Brief history complete, let’s skip to the part where I’ve chosen to shoot it regularly through factory-stock 10mm GLOCKs. . .
http://www.thetruthaboutguns.com/2015/06/jeremy-s/40-in-a-10mm-glock/
Why I Shoot .40 Through My Unmodified 10mm GLOCK
By Jeremy S on June 26, 2015
10mm Auto came first. The FBI chose a watered-down loading — a 180 grain bullet at 975 fps instead of more like 1,300 fps — and a large-frame S&W pistol through which to shoot it. By the time the contract went through, Tom Campbell, S&W employee, had realized that the powder capacity of the 10mm’s 25.2 mm-long case simply wasn’t necessary to achieve this same velocity, and the .40 S&W with its 21.6 mm-long case was born. For all intents and purposes, .40 S&W is really “10mm Short & Weak.” Brief history complete, let’s skip to the part where I’ve chosen to shoot it regularly through factory-stock 10mm GLOCKs. . .
http://www.thetruthaboutguns.com/2015/06/jeremy-s/40-in-a-10mm-glock/