A scorched or black crud patch is not the end of the world. Even if the ends are frilled. What you need to look at is patches with holes in them, torn, or pieces missing. That normally means the patch can not support the pressure behind it. This can be cause by the patchbeing old as I have seen old patches blow apart. A poor lube will allow the ignition flame to blow them up as well. Triple Se7en produces more heat then other powders and this can account for blown patches. The wad between the powder and patch will protect the patch. I have shot some that the patch is in such pristine condition you could, and I have (for fun), use them again if you really wanted to. I make a lot of my wads out of wool felt using a hollow hole punch.

http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=3838

I then dip them in home made lube I have melted, or will smear them on the range. They protect the patch and help clean the barrel at the same time. In the White I shoot, I did purchase some fiber wads in .510 diameter and they work real good. I got them at TOTW.