Any negatives on 7 vs 6 shot revolvers, particularly the 686? I am looking to purchase a 686 and see that they now come in 7 shot configuration. Are they inherently weaker in the cylinder? No difference? Bigger cyl diameter? I haven't seen anything either way about the 7 shot pistols. I've owned several 686's and all I know is that I like the 6 shot and would have to buy new speed loaders! I mean, except for that one extra round, is there any other advantage?