I'm for no tacks....definitely not daisy tacks. Having said that, though, the three tacks you have placed don't look too bad, but NO MORE! Get some antique PC tacks if you must attack your gun.
Jeremiah Johnson has some GREAT dialogue lines....you've got to admit it. One of my favorites: "Paints His Shirt Red speaks English....he just does this to aggravate me...."
Believe it or not, a bean bag to rest the horn on while holding it with your hand works pretty well. Sew yourself the size bag you want and fill it with dry navy beans from Kroger.
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I know...I looked it up! Always good to learn a new word. I'm going to use it next chance I get, and I am going to use the French pronunciation to see what kind of reaction I get. LOL
My opinion: Don't worry about a little oil in the bore of a gun. I'm assuming you will run a dry path down the barrel just to make sure it isn't sopping wet.
I attended a reenactment at Martin Station in Western Virginia several years ago and they were pretty safety-conscious. The head honcho inspected my flintlock and gave me a small piece of red yarn to tie around the end of the ramrod to remind me not to use the ramrod. Powder was distributed in...