Do you get noticible barrel leading with the higher charge? I shoot a 40 but I prefer heavier bullets and I cast my own 175 grain bullets. I have fewer problems than with lighter bullets and they are very accurate. Regarding SD: anything is better than nothing. If you are pumping off a rapid volley of 40 call bullets you will not be in bad shape. I hope you never have to do it.
Gun control is hitting what you aim at..