I use a Lee undersize die for sizing brass fired in a glock. It works great.
What you are referring to is chamber forming the brass. When you shoot a round in a bolt action rifle, the brass custom forms to that chamber. Now when you reload, you neck size only. And you can taper crimp the bullet. You still need to check the length of the brass and see if it needs trimming before loading.
On semi-auto rifles it's still wise to full length size the brass and roll crimp the bullets.
My .40 Lee dies didn't remove the Glock bulge so I tried the EGW undersize die that does work but it is also stretching the cases about .004 inch causing it to not go into my gauge. Gauge seems to be a little under the .850 max. Pretty new to .40 reloading, has anybody had this problem?
Thanks in advance
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