I have always used a fouling shot because that was the way I was taught. Seems to work for me. I usually load pop a cap only off first and then a cap with 10-15 grains poured down the barrel. Followed by a wet, then dry patch before I load up for a hunt. I have left my rifle loaded for the entire hunt (up to a week) and it has always gone off at the end of the hunt normally.

If I find some Black mag 3 to use, I may try it both ways and see if there is any difference.

As you can see, there are as many opinions out there as people doing one thing or another!