I genuinely wish people would stop just simply repeating what they have read on the net and actually get some actual experience before they offer up advice.
People read "You must be limp wristing" and You can't shoot lead through Glocks" and just repeat it over and over ad nauseum.
The G30 has octagonal rifling, as does the G21.
I have shot many tens of thousands of hard cast bullets through multiple .45 ACP Glocks and never, not once had a single issue. I know my G21 I used for USPSA was well north of 50K, between using it for work, competition, teaching and pretty much everything else. It lived on a diet of 200 grain H&G SWCs and Clays.
The fact is that you absolutely can shoot hard cast lead bullets through factory stock Glock barrels with no issue at all.
In regards to "over penetration", it is not hard to tailor a given bullet, such as the one 03RN has pictured above to perform within your desired parameters. To imply that using hard cast SWC/hunting style bullets is not what a "responsible concealed carry" type person does shows a serious lack of understanding of the subject at hand, as do the comments about not being able to shoot hard cast bullets through .45 ACP Glocks.