SD40VE Bulge in spent casing

[Aladinbama]

I've got a new SD40VE that I just took to the range for the first time this past Saturday. After firing 35-40 rounds I noticed a bulge in the casing near the rim of the spent brass. Is this normal?
I actually wrote S&W and they told me it was necessary to help feeding of the round, but this is the first I have ever seen of anything like this so I thought I'd post the question here.

 

[snubbyfan]

Seems like a common occurance.

http://smith-wessonforum.com/smith-wesson-sd-sigma-pistols/197394-sd-40-a.html

http://smith-wessonforum.com/smith-wesson-sd-sigma-pistols/278030-sd40ve-shell-bulges-typical.html

http://smith-wessonforum.com/smith-...7460-new-sd40ve-owner-hope-its-good-move.html

http://smith-wessonforum.com/smith-...ought-my-first-smith-sd40ve-range-report.html

http://smith-wessonforum.com/smith-wesson-m-p-pistols/308251-any-idea-what-might-cause.html

 

[frankmako]

there is another post going on right now on the same subject. this is normal in most all 40 s&w cal guns. if you think your case are bad you should see some of the cases from the first glock 40 cals guns.