Cast Lead and Glocks

[Heavy Metal]

.357?

9mm bullets are supposed to be .355.

[rat31465]

For the most part .355" is the correct dia for 9mm bullets if Jacketed.

Casters often over size the bullets some to help ensure a better seal.
I have been using .357 dia bullets in 9 mm and .38 Super for more than 20 years.
I use them in the glock since the polygonal rifling upsets the bullets shape rather than cut into as with square cut rifling methods.
I believe that this is why I have had good results with cast lead in the Glock.