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.40 S&W with JACKETED bullets. The polygonal rifling in a Glock does not mix well with lead bullets.
The barrels of Glock pistols use a different style of rifling, known as polygonal rifling. When shooting cast bullets, this rifling will get smeared with lead (known as "leading up"), and the pistol becomes unsafe to shoot.
TMJ (Total Metal Jacket) bullets should be safe in a Glock with polygonal rifling. It IS fully jacketed ammo. Glocks do not do well with cast lead bullets.
You can hand load, just no lead unjacketed bullets.
Glock pistols are made in a variety of calibers. Currently available in .380 ACP, 9mm Luger, .357 Sig, .40 S&W, 10mm Auto, .45 ACP and .45 GAP.
No
There are 3 different magazines for a Glock 23- 10 CARTRIDGES (not bullets) or 13 or 15.
FBI and US Marshals issue Glock 22.
No
Probably never.
Yes, like other auto-loading firearms the Glock will feed and fire hollowpoint bullets.
Well there are many different BRANDS of ammuntion that you can buy for a glock. but obviously you will need 9mm bullets for a 9mm gun.