Uhhgggg we go through the same thing at my range... People hitting the target legs on the pistol ranges and have to be replaced... Good grief , like you said you have this huge backer and you hit the legs... Most of the people I see shooting aren't shooting over 10 - 15 yards.... To me that's horrible , I understand not everyone can shoot a 2-3 inch group but if you're shooting a 2-3 foot group at 15 yards it's time to find another hobby....I guess this is suppose to be funny but it doesn't contribute to helping a pistol shooter in becoming a better shot. We certainly need better pistol shooters at the club I belong to - the target backers are under constant damage / repair - the backers are 30 x 30 inches!
Would have been more useful if the standard diagram depicting pistol shooting errors and causes would have been posted but I've learn not to take anything too seriously these days.
