As an answer to the, so far, unasked question "What angle on the patch is best"? The answer is simply whatever works best for you. I have seen it expounded upon that the best angle is a 30 degree or that the 60 degree is best and of course there is the faction swearing by the 45 degree cut. I`ve seen different "experts" in publications from the Rifleman to books by authors that have lived with patching and all seem to favor different angle cuts. Myself, I use a 60 degree angle cut with decent success. So if I were giving advice, try all three angles and see what works for you.
Montana Charlie. Yup, that open spot is on all my patched slugs and it works fair by me.Robert