"NwG, have you ever seen a shotgun wound from close range in which birdshot was used"
Yes I have.. Of the three birdshot cases I have seen only one penatrated into the vital cavity.. But did not do sunifagant enough damage to vital organs to stop the victim from running 3 blocks.. The shot was reportedly at a range of 10 feet.. The other two stripped most of the tissue from the outside of the rib cage in around a 15x15cm area.. Both victims were able to call EMS themselves..
Of the 5 or so buckshot wounds I have seen.. All were DOA.. X-ray showed the mojority of the shot resting just under the skin of the back, but no exit wounds.. In most cases each buckshot will generate a fatal wound.. One case showed 3 of the buckshot lodged in the spine.. That shot had both massive vital organ damage and multiple central nervous system disruptions.. Couldn't ask for more than that out of a HD wepon...
And yes you are free to do what you want, shoot what you want, and do anything you like (within legal means) to your weapons.. Nobody is going to stop you from doing so.. But with does come to a point where you are only hurting your ability and accuracy... You may not think so, but try going up vs somebody who is well trained with the proper equpement... Because some of the BG's out there are.......