I had practiced shooting from 7 meters like with the cowboy style using a single action revolver. My target is a steel popper. One of the shooter scolded me that I should not do that bec. the bullets may bounce back. I was amazed or surprised where he got that idea. I've been doing that for the past 10 years.
My favorite distance is from 10 to 15 meters, besides, if we really shoot for self defense there is no need to practice in from 25 to 30 meters as I usually saw on the range. Some shooters think they are so good if they shoot too far. But to my own opion, the 10 to 15 meters is good enough, in real scenario the 7 to 10 is more practical to practice. If a bad guy is in 25 to 30 meters perhaps, I won't shoot him anymore, I consider him as a no threat to me already.
Just my own humble opinion.