No free bore on LW .40 S&W barrel? [Archive] - Glock Talk

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bushpilotmexico
04-29-2011, 16:09
Why does the .40 S&W LW barrel not have some free bore ahead of the chamber.

This lack of free bore necessitates loading a .401 cast bullet less than the recommended OAL.

Over seating the bullet can cause excessive chamber pressures potentially causing head separation of the case and explosive results!

JR
04-29-2011, 19:26
Seating your bullet to the lands produces the best accuarcy. Yes it can increase pressures however "if" you start with a reduced load and work it up you will not run into a pressure issue.
If you want more lead you can send us a few sample loads (no primer or powder) and we will open the chamber to fit. Cost for this service is $25